Ecrit par ✅ Quiz : Reflexion Et Refraction Des Ondes
Ce quiz contient 20 questions.
Note : Placeholder pour valider la structure. Le JSON converti est conservé ci-dessous pour l’import final des vraies questions Tutor LMS.
JSON Tutor LMS-ready
{
"quiz_title": "Reflexion Et Refraction Des Ondes",
"quiz_slug": "04_reflexion_et_refraction_des_ondes_quiz",
"quiz_description": "Quiz Edu509 : Reflexion Et Refraction Des Ondes",
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"time_type": "minutes"
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"questions": [
{
"question_order": 1,
"question_title": "Un rayon lumineux frappe un miroir plan avec un angle d’incidence de \\\\(40^\\\\circ\\\\) par rapport à la normale. Quel est l’angle de réflexion ?",
"question_type": "single_choice",
"question_mark": 1,
"answer_required": true,
"randomize_question": false,
"show_question_mark": true,
"question_description": "",
"question_explanation": "Selon la loi de la réflexion, l’angle de réflexion est égal à l’angle d’incidence. Donc \\\\(r = 40^\\\\circ\\\\).",
"answers": [
{
"answer_title": "\\\\(40^\\\\circ\\\\)",
"is_correct": true,
"answer_order": 1
},
{
"answer_title": "\\\\(20^\\\\circ\\\\)",
"is_correct": false,
"answer_order": 2
},
{
"answer_title": "\\\\(50^\\\\circ\\\\)",
"is_correct": false,
"answer_order": 3
},
{
"answer_title": "\\\\(80^\\\\circ\\\\)",
"is_correct": false,
"answer_order": 4
}
]
},
{
"question_order": 2,
"question_title": "Un rayon lumineux passe de l’air (\\\\(n_1 = 1{,}00\\\\)) dans l’eau (\\\\(n_2 = 1{,}33\\\\)) avec un angle d’incidence de \\\\(60^\\\\circ\\\\). Quel est l’angle de réfraction ?",
"question_type": "single_choice",
"question_mark": 1,
"answer_required": true,
"randomize_question": false,
"show_question_mark": true,
"question_description": "",
"question_explanation": "On utilise la loi de Snell-Descartes : \\\\(1{,}00 \\\\times \\\\sin(60^\\\\circ) = 1{,}33 \\\\times \\\\sin(r')\\\\). \\\\(\\\\sin(60^\\\\circ) = 0{,}866\\\\). \\\\(\\\\sin(r') = 0{,}866/1{,}33 = 0{,}651\\\\). \\\\(r' = \\\\arcsin(0{,}651) \\\\approx 40{,}6^\\\\circ\\\\).",
"answers": [
{
"answer_title": "\\\\(40{,}6^\\\\circ\\\\)",
"is_correct": true,
"answer_order": 1
},
{
"answer_title": "\\\\(60^\\\\circ\\\\)",
"is_correct": false,
"answer_order": 2
},
{
"answer_title": "\\\\(30^\\\\circ\\\\)",
"is_correct": false,
"answer_order": 3
},
{
"answer_title": "\\\\(48{,}8^\\\\circ\\\\)",
"is_correct": false,
"answer_order": 4
}
]
},
{
"question_order": 3,
"question_title": "Dans la réflexion, quel paramètre reste inchangé ?",
"question_type": "single_choice",
"question_mark": 1,
"answer_required": true,
"randomize_question": false,
"show_question_mark": true,
"question_description": "",
"question_explanation": "Lors de la réflexion, la fréquence de l’onde ne change pas. La direction change, mais la fréquence reste constante.",
"answers": [
{
"answer_title": "La fréquence de l’onde",
"is_correct": true,
"answer_order": 1
},
{
"answer_title": "La direction de propagation",
"is_correct": false,
"answer_order": 2
},
{
"answer_title": "L’amplitude",
"is_correct": false,
"answer_order": 3
},
{
"answer_title": "La vitesse de l’onde",
"is_correct": false,
"answer_order": 4
}
]
},
{
"question_order": 4,
"question_title": "Un rayon lumineux passe du verre (\\\\(n_1 = 1{,}50\\\\)) à l’air (\\\\(n_2 = 1{,}00\\\\)) avec un angle d’incidence de \\\\(30^\\\\circ\\\\). Quel est l’angle de réfraction ?",
"question_type": "single_choice",
"question_mark": 1,
"answer_required": true,
"randomize_question": false,
"show_question_mark": true,
"question_description": "",
"question_explanation": "Loi de Snell-Descartes : \\\\(1{,}50 \\\\times \\\\sin(30^\\\\circ) = 1{,}00 \\\\times \\\\sin(r')\\\\). \\\\(\\\\sin(30^\\\\circ) = 0{,}5\\\\). \\\\(1{,}50 \\\\times 0{,}5 = 0{,}75\\\\). \\\\(\\\\sin(r') = 0{,}75\\\\). \\\\(r' = \\\\arcsin(0{,}75) \\\\approx 48{,}6^\\\\circ\\\\).",
"answers": [
{
"answer_title": "\\\\(48{,}6^\\\\circ\\\\)",
"is_correct": true,
"answer_order": 1
},
{
"answer_title": "\\\\(30^\\\\circ\\\\)",
"is_correct": false,
"answer_order": 2
},
{
"answer_title": "\\\\(19{,}5^\\\\circ\\\\)",
"is_correct": false,
"answer_order": 3
},
{
"answer_title": "\\\\(60^\\\\circ\\\\)",
"is_correct": false,
"answer_order": 4
}
]
},
{
"question_order": 5,
"question_title": "Quelle est la formule de la loi de la réflexion ?",
"question_type": "single_choice",
"question_mark": 1,
"answer_required": true,
"randomize_question": false,
"show_question_mark": true,
"question_description": "",
"question_explanation": "La loi de la réflexion s’écrit \\\\(i = r\\\\), où \\\\(i\\\\) est l’angle d’incidence et \\\\(r\\\\) l’angle de réflexion.",
"answers": [
{
"answer_title": "\\\\(i = r\\\\)",
"is_correct": true,
"answer_order": 1
},
{
"answer_title": "\\\\(n_1 \\\\sin(i) = n_2 \\\\sin(r')\\\\)",
"is_correct": false,
"answer_order": 2
},
{
"answer_title": "\\\\(v = \\\\lambda f\\\\)",
"is_correct": false,
"answer_order": 3
},
{
"answer_title": "\\\\(n = \\\\frac{c}{v}\\\\)",
"is_correct": false,
"answer_order": 4
}
]
},
{
"question_order": 6,
"question_title": "Un rayon lumineux passe de l’eau (\\\\(n_1 = 1{,}33\\\\)) au verre (\\\\(n_2 = 1{,}50\\\\)) avec un angle d’incidence de \\\\(25^\\\\circ\\\\). Quel est l’angle de réfraction ?",
"question_type": "single_choice",
"question_mark": 1,
"answer_required": true,
"randomize_question": false,
"show_question_mark": true,
"question_description": "",
"question_explanation": "Loi de Snell-Descartes : \\\\(1{,}33 \\\\sin(25^\\\\circ) = 1{,}50 \\\\sin(r')\\\\). \\\\(\\\\sin(25^\\\\circ) = 0{,}423\\\\). \\\\(1{,}33 \\\\times 0{,}423 = 0{,}563\\\\). \\\\(\\\\sin(r') = 0{,}563/1{,}50 = 0{,}375\\\\). \\\\(r' = \\\\arcsin(0{,}375) \\\\approx 22{,}0^\\\\circ\\\\).",
"answers": [
{
"answer_title": "\\\\(22{,}0^\\\\circ\\\\)",
"is_correct": true,
"answer_order": 1
},
{
"answer_title": "\\\\(25^\\\\circ\\\\)",
"is_correct": false,
"answer_order": 2
},
{
"answer_title": "\\\\(28^\\\\circ\\\\)",
"is_correct": false,
"answer_order": 3
},
{
"answer_title": "\\\\(18^\\\\circ\\\\)",
"is_correct": false,
"answer_order": 4
}
]
},
{
"question_order": 7,
"question_title": "Lorsqu’une onde passe d’un milieu moins réfringent à un milieu plus réfringent, que se passe-t-il pour l’angle de réfraction ?",
"question_type": "single_choice",
"question_mark": 1,
"answer_required": true,
"randomize_question": false,
"show_question_mark": true,
"question_description": "",
"question_explanation": "En passant dans un milieu plus réfringent, l’angle de réfraction diminue par rapport à l’angle d’incidence.",
"answers": [
{
"answer_title": "Il diminue",
"is_correct": true,
"answer_order": 1
},
{
"answer_title": "Il augmente",
"is_correct": false,
"answer_order": 2
},
{
"answer_title": "Il reste inchangé",
"is_correct": false,
"answer_order": 3
},
{
"answer_title": "Il devient nul",
"is_correct": false,
"answer_order": 4
}
]
},
{
"question_order": 8,
"question_title": "Un rayon lumineux passe de l’air (\\\\(n_1 = 1{,}00\\\\)) dans le diamant (\\\\(n_2 = 2{,}42\\\\)) avec un angle d’incidence de \\\\(45^\\\\circ\\\\). Quel est l’angle de réfraction ?",
"question_type": "single_choice",
"question_mark": 1,
"answer_required": true,
"randomize_question": false,
"show_question_mark": true,
"question_description": "",
"question_explanation": "Loi de Snell-Descartes : \\\\(1{,}00 \\\\sin(45^\\\\circ) = 2{,}42 \\\\sin(r')\\\\). \\\\(\\\\sin(45^\\\\circ) = 0{,}707\\\\). \\\\(\\\\sin(r') = 0{,}707/2{,}42 = 0{,}292\\\\). \\\\(r' = \\\\arcsin(0{,}292) \\\\approx 16{,}7^\\\\circ\\\\).",
"answers": [
{
"answer_title": "\\\\(16{,}7^\\\\circ\\\\)",
"is_correct": true,
"answer_order": 1
},
{
"answer_title": "\\\\(45^\\\\circ\\\\)",
"is_correct": false,
"answer_order": 2
},
{
"answer_title": "\\\\(25^\\\\circ\\\\)",
"is_correct": false,
"answer_order": 3
},
{
"answer_title": "\\\\(30^\\\\circ\\\\)",
"is_correct": false,
"answer_order": 4
}
]
},
{
"question_order": 9,
"question_title": "Quelle grandeur ne change jamais lors de la réfraction d’une onde ?",
"question_type": "single_choice",
"question_mark": 1,
"answer_required": true,
"randomize_question": false,
"show_question_mark": true,
"question_description": "",
"question_explanation": "La fréquence de l’onde reste constante lors de la réfraction, même si la vitesse et la longueur d’onde changent.",
"answers": [
{
"answer_title": "La fréquence",
"is_correct": true,
"answer_order": 1
},
{
"answer_title": "La vitesse",
"is_correct": false,
"answer_order": 2
},
{
"answer_title": "La longueur d’onde",
"is_correct": false,
"answer_order": 3
},
{
"answer_title": "L’amplitude",
"is_correct": false,
"answer_order": 4
}
]
},
{
"question_order": 10,
"question_title": "Un rayon lumineux passe du verre (\\\\(n_1 = 1{,}50\\\\)) à l’eau (\\\\(n_2 = 1{,}33\\\\)) avec un angle d’incidence de \\\\(35^\\\\circ\\\\). Quel est l’angle de réfraction ?",
"question_type": "single_choice",
"question_mark": 1,
"answer_required": true,
"randomize_question": false,
"show_question_mark": true,
"question_description": "",
"question_explanation": "Loi de Snell-Descartes : \\\\(1{,}50 \\\\sin(35^\\\\circ) = 1{,}33 \\\\sin(r')\\\\). \\\\(\\\\sin(35^\\\\circ) = 0{,}574\\\\). \\\\(1{,}50 \\\\times 0{,}574 = 0{,}861\\\\). \\\\(\\\\sin(r') = 0{,}861/1{,}33 = 0{,}648\\\\). \\\\(r' = \\\\arcsin(0{,}648) \\\\approx 40{,}2^\\\\circ\\\\).",
"answers": [
{
"answer_title": "\\\\(40{,}2^\\\\circ\\\\)",
"is_correct": true,
"answer_order": 1
},
{
"answer_title": "\\\\(35^\\\\circ\\\\)",
"is_correct": false,
"answer_order": 2
},
{
"answer_title": "\\\\(30^\\\\circ\\\\)",
"is_correct": false,
"answer_order": 3
},
{
"answer_title": "\\\\(25^\\\\circ\\\\)",
"is_correct": false,
"answer_order": 4
}
]
},
{
"question_order": 11,
"question_title": "Quelle est la condition pour qu’il y ait réflexion totale lors du passage d’un rayon lumineux d’un milieu à un autre ?",
"question_type": "single_choice",
"question_mark": 1,
"answer_required": true,
"randomize_question": false,
"show_question_mark": true,
"question_description": "",
"question_explanation": "La réflexion totale se produit lorsque l’angle d’incidence dépasse l’angle limite, et le rayon reste entièrement dans le premier milieu.",
"answers": [
{
"answer_title": "L’angle d’incidence est supérieur à l’angle limite",
"is_correct": true,
"answer_order": 1
},
{
"answer_title": "L’indice du second milieu est plus grand",
"is_correct": false,
"answer_order": 2
},
{
"answer_title": "L’angle de réfraction est nul",
"is_correct": false,
"answer_order": 3
},
{
"answer_title": "La fréquence change",
"is_correct": false,
"answer_order": 4
}
]
},
{
"question_order": 12,
"question_title": "Un rayon lumineux passe de l’eau (\\\\(n_1 = 1{,}33\\\\)) à l’air (\\\\(n_2 = 1{,}00\\\\)) avec un angle d’incidence de \\\\(50^\\\\circ\\\\). Quel est l’angle de réfraction ?",
"question_type": "single_choice",
"question_mark": 1,
"answer_required": true,
"randomize_question": false,
"show_question_mark": true,
"question_description": "",
"question_explanation": "Pour \\\\(i = 50^\\\\circ\\\\), \\\\(1,33 \\\\sin(50^\\\\circ) = 1,00 \\\\sin(r')\\\\). \\\\(\\\\sin(50^\\\\circ) = 0,766\\\\). \\\\(1,33 \\\\times 0,766 = 1,018\\\\). \\\\(\\\\sin(r') = 1,018\\\\), ce qui est impossible. Il y a donc réflexion totale.",
"answers": [
{
"answer_title": "Réflexion totale",
"is_correct": true,
"answer_order": 1
},
{
"answer_title": "\\\\(50^\\\\circ\\\\)",
"is_correct": false,
"answer_order": 2
},
{
"answer_title": "\\\\(38^\\\\circ\\\\)",
"is_correct": false,
"answer_order": 3
},
{
"answer_title": "\\\\(60^\\\\circ\\\\)",
"is_correct": false,
"answer_order": 4
}
]
},
{
"question_order": 13,
"question_title": "Quelle est la formule de la loi de la réfraction (Snell-Descartes) ?",
"question_type": "single_choice",
"question_mark": 1,
"answer_required": true,
"randomize_question": false,
"show_question_mark": true,
"question_description": "",
"question_explanation": "La loi de la réfraction s’écrit \\\\(n_1 \\\\sin(i) = n_2 \\\\sin(r')\\\\).",
"answers": [
{
"answer_title": "\\\\(n_1 \\\\sin(i) = n_2 \\\\sin(r')\\\\)",
"is_correct": true,
"answer_order": 1
},
{
"answer_title": "\\\\(i = r\\\\)",
"is_correct": false,
"answer_order": 2
},
{
"answer_title": "\\\\(v = \\\\lambda f\\\\)",
"is_correct": false,
"answer_order": 3
},
{
"answer_title": "\\\\(n = \\\\frac{c}{v}\\\\)",
"is_correct": false,
"answer_order": 4
}
]
},
{
"question_order": 14,
"question_title": "Un rayon lumineux passe de l’air (\\\\(n_1 = 1{,}00\\\\)) dans l’eau (\\\\(n_2 = 1{,}33\\\\)) avec un angle d’incidence de \\\\(0^\\\\circ\\\\). Quel est l’angle de réfraction ?",
"question_type": "single_choice",
"question_mark": 1,
"answer_required": true,
"randomize_question": false,
"show_question_mark": true,
"question_description": "",
"question_explanation": "Si l’angle d’incidence est nul, le rayon entre perpendiculairement à la surface et ne change pas de direction. L’angle de réfraction est donc aussi nul.",
"answers": [
{
"answer_title": "\\\\(0^\\\\circ\\\\)",
"is_correct": true,
"answer_order": 1
},
{
"answer_title": "\\\\(45^\\\\circ\\\\)",
"is_correct": false,
"answer_order": 2
},
{
"answer_title": "\\\\(90^\\\\circ\\\\)",
"is_correct": false,
"answer_order": 3
},
{
"answer_title": "\\\\(30^\\\\circ\\\\)",
"is_correct": false,
"answer_order": 4
}
]
},
{
"question_order": 15,
"question_title": "Un rayon lumineux passe du verre (\\\\(n_1 = 1{,}50\\\\)) à l’air (\\\\(n_2 = 1{,}00\\\\)). Quel est l’angle limite pour la réflexion totale ?",
"question_type": "single_choice",
"question_mark": 1,
"answer_required": true,
"randomize_question": false,
"show_question_mark": true,
"question_description": "",
"question_explanation": "L’angle limite est donné par \\\\(\\\\sin(i_{limite}) = \\\\frac{n_2}{n_1} = \\\\frac{1,00}{1,50} = 0,667\\\\). \\\\(i_{limite} = \\\\arcsin(0,667) \\\\approx 41,8^\\\\circ\\\\).",
"answers": [
{
"answer_title": "\\\\(41{,}8^\\\\circ\\\\)",
"is_correct": true,
"answer_order": 1
},
{
"answer_title": "\\\\(30^\\\\circ\\\\)",
"is_correct": false,
"answer_order": 2
},
{
"answer_title": "\\\\(60^\\\\circ\\\\)",
"is_correct": false,
"answer_order": 3
},
{
"answer_title": "\\\\(50^\\\\circ\\\\)",
"is_correct": false,
"answer_order": 4
}
]
},
{
"question_order": 16,
"question_title": "Une onde sonore passe de l’air (\\\\(v_1 = 340\\\\,\\\\mathrm{m/s}\\\\)) dans l’eau (\\\\(v_2 = 1500\\\\,\\\\mathrm{m/s}\\\\)) avec un angle d’incidence de \\\\(20^\\\\circ\\\\). Quel est l’angle de réfraction ?",
"question_type": "single_choice",
"question_mark": 1,
"answer_required": true,
"randomize_question": false,
"show_question_mark": true,
"question_description": "",
"question_explanation": "On utilise \\\\(v_1 \\\\sin(i) = v_2 \\\\sin(r')\\\\). \\\\(340 \\\\times \\\\sin(20^\\\\circ) = 1500 \\\\times \\\\sin(r')\\\\). \\\\(\\\\sin(20^\\\\circ) = 0,342\\\\). \\\\(340 \\\\times 0,342 = 116,3\\\\). \\\\(\\\\sin(r') = 116,3/1500 = 0,0775\\\\). \\\\(r' = \\\\arcsin(0,0775) \\\\approx 4,44^\\\\circ\\\\).",
"answers": [
{
"answer_title": "\\\\(4{,}44^\\\\circ\\\\)",
"is_correct": true,
"answer_order": 1
},
{
"answer_title": "\\\\(20^\\\\circ\\\\)",
"is_correct": false,
"answer_order": 2
},
{
"answer_title": "\\\\(10^\\\\circ\\\\)",
"is_correct": false,
"answer_order": 3
},
{
"answer_title": "\\\\(30^\\\\circ\\\\)",
"is_correct": false,
"answer_order": 4
}
]
},
{
"question_order": 17,
"question_title": "Dans quel cas observe-t-on un écho sonore ?",
"question_type": "single_choice",
"question_mark": 1,
"answer_required": true,
"randomize_question": false,
"show_question_mark": true,
"question_description": "",
"question_explanation": "Un écho est le résultat de la réflexion d’une onde sonore sur un obstacle.",
"answers": [
{
"answer_title": "Lorsqu’une onde sonore est réfléchie par un obstacle",
"is_correct": true,
"answer_order": 1
},
{
"answer_title": "Lorsqu’une onde sonore est réfractée",
"is_correct": false,
"answer_order": 2
},
{
"answer_title": "Lorsqu’une onde sonore change de fréquence",
"is_correct": false,
"answer_order": 3
},
{
"answer_title": "Lorsqu’une onde sonore est absorbée",
"is_correct": false,
"answer_order": 4
}
]
},
{
"question_order": 18,
"question_title": "Un rayon lumineux passe de l’air (\\\\(n_1 = 1{,}00\\\\)) dans un liquide inconnu avec un angle d’incidence de \\\\(30^\\\\circ\\\\) et un angle de réfraction de \\\\(20^\\\\circ\\\\). Quel est l’indice de réfraction du liquide ?",
"question_type": "single_choice",
"question_mark": 1,
"answer_required": true,
"randomize_question": false,
"show_question_mark": true,
"question_description": "",
"question_explanation": "Loi de Snell-Descartes : \\\\(1,00 \\\\sin(30^\\\\circ) = n_2 \\\\sin(20^\\\\circ)\\\\). \\\\(\\\\sin(30^\\\\circ) = 0,5\\\\), \\\\(\\\\sin(20^\\\\circ) = 0,342\\\\). \\\\(n_2 = 0,5/0,342 = 1,46\\\\).",
"answers": [
{
"answer_title": "1,46",
"is_correct": true,
"answer_order": 1
},
{
"answer_title": "1,33",
"is_correct": false,
"answer_order": 2
},
{
"answer_title": "1,20",
"is_correct": false,
"answer_order": 3
},
{
"answer_title": "1,50",
"is_correct": false,
"answer_order": 4
}
]
},
{
"question_order": 19,
"question_title": "Un rayon lumineux passe de l’air (\\\\(n_1 = 1{,}00\\\\)) dans l’eau (\\\\(n_2 = 1{,}33\\\\)) avec un angle d’incidence de \\\\(75^\\\\circ\\\\). Quel est l’angle de réfraction ?",
"question_type": "single_choice",
"question_mark": 1,
"answer_required": true,
"randomize_question": false,
"show_question_mark": true,
"question_description": "",
"question_explanation": "Loi de Snell-Descartes : \\\\(1,00 \\\\sin(75^\\\\circ) = 1,33 \\\\sin(r')\\\\). \\\\(\\\\sin(75^\\\\circ) = 0,966\\\\). \\\\(\\\\sin(r') = 0,966/1,33 = 0,726\\\\). \\\\(r' = \\\\arcsin(0,726) \\\\approx 47,2^\\\\circ\\\\).",
"answers": [
{
"answer_title": "\\\\(47{,}2^\\\\circ\\\\)",
"is_correct": true,
"answer_order": 1
},
{
"answer_title": "\\\\(75^\\\\circ\\\\)",
"is_correct": false,
"answer_order": 2
},
{
"answer_title": "\\\\(60^\\\\circ\\\\)",
"is_correct": false,
"answer_order": 3
},
{
"answer_title": "\\\\(30^\\\\circ\\\\)",
"is_correct": false,
"answer_order": 4
}
]
},
{
"question_order": 20,
"question_title": "Un rayon lumineux passe de l’eau (\\\\(n_1 = 1{,}33\\\\)) dans l’air (\\\\(n_2 = 1{,}00\\\\)) avec un angle d’incidence de \\\\(30^\\\\circ\\\\). Quel est l’angle de réfraction ?",
"question_type": "single_choice",
"question_mark": 1,
"answer_required": true,
"randomize_question": false,
"show_question_mark": true,
"question_description": "",
"question_explanation": "Loi de Snell-Descartes : \\\\(1,33 \\\\sin(30^\\\\circ) = 1,00 \\\\sin(r')\\\\). \\\\(\\\\sin(30^\\\\circ) = 0,5\\\\). \\\\(1,33 \\\\times 0,5 = 0,665\\\\). \\\\(\\\\sin(r') = 0,665/1,00 = 0,665\\\\). \\\\(r' = \\\\arcsin(0,665) \\\\approx 41,8^\\\\circ\\\\).",
"answers": [
{
"answer_title": "\\\\(41{,}8^\\\\circ\\\\)",
"is_correct": true,
"answer_order": 1
},
{
"answer_title": "\\\\(30^\\\\circ\\\\)",
"is_correct": false,
"answer_order": 2
},
{
"answer_title": "\\\\(25^\\\\circ\\\\)",
"is_correct": false,
"answer_order": 3
},
{
"answer_title": "\\\\(60^\\\\circ\\\\)",
"is_correct": false,
"answer_order": 4
}
]
}
]
}