Quiz — 147.._serie onde 1 4 math+4 Sc 2020.pdf

Question 1 sur 10 20:00

[{"id":27920,"question":"Quelle est la relation entre la longueur d'onde λ, la fréquence f et la célérité v d'une onde ?","option_a":"A. v = λ × f","option_b":"B. v = λ \/ f","option_c":"C. v = f \/ λ","option_d":"D. v = λ + f","option_e":"","option_f":"","bonne_reponse":"a","explication":"La célérité d'une onde est égale au produit de sa longueur d'onde par sa fréquence : v = λ × f.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"A. v = λ × f\", \"b\": \"B. v = λ \/ f\", \"c\": \"C. v = f \/ λ\", \"d\":","_debug_options_count":4},{"id":27921,"question":"L'équation d'une onde progressive sinusoïdale s'écrit y(x,t) = A sin(ωt - kx). Que représente k ?","option_a":"A. L'amplitude de l'onde","option_b":"B. La fréquence angulaire","option_c":"C. Le nombre d'onde","option_d":"D. La phase initiale","option_e":"","option_f":"","bonne_reponse":"c","explication":"k est le nombre d'onde, lié à la longueur d'onde par k = 2π\/λ.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"c\", \"options\": {\"a\": \"A. L'amplitude de l'onde\", \"b\": \"B. La fréquence angulaire\", \"c\"","_debug_options_count":4},{"id":27922,"question":"Vrai ou Faux ? Une onde électromagnétique peut se propager dans le vide.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"Les ondes électromagnétiques, comme la lumière, se propagent dans le vide à la célérité c ≈ 3×10⁸ m\/s.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"Vrai\", \"b\": \"Faux\", \"c\": \"\", \"d\": \"\"}}","_debug_options_count":4},{"id":27923,"question":"Quelle est la période T d'une onde de fréquence f = 50 Hz ?","option_a":"A. 0,02 s","option_b":"B. 0,2 s","option_c":"C. 2 s","option_d":"D. 50 s","option_e":"","option_f":"","bonne_reponse":"a","explication":"La période est l'inverse de la fréquence : T = 1\/f = 1\/50 = 0,02 s.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"A. 0,02 s\", \"b\": \"B. 0,2 s\", \"c\": \"C. 2 s\", \"d\": \"D. 50 s\"}}","_debug_options_count":4},{"id":27924,"question":"Vrai ou Faux ? L'amplitude d'une onde correspond à sa célérité.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"b","explication":"L'amplitude représente l'écart maximal par rapport à la position d'équilibre, tandis que la célérité est la vitesse de propagation de l'onde.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"Vrai\", \"b\": \"Faux\", \"c\": \"\", \"d\": \"\"}}","_debug_options_count":4},{"id":27925,"question":"Quelle fonction mathématique modélise généralement une onde stationnaire ?","option_a":"A. y(x,t) = A sin(ωt) cos(kx)","option_b":"B. y(x,t) = A sin(ωt + kx)","option_c":"C. y(x,t) = A e^(iωt)","option_d":"D. y(x,t) = A cos(ωt - kx)","option_e":"","option_f":"","bonne_reponse":"a","explication":"Une onde stationnaire résulte de la superposition de deux ondes progressives de même amplitude et fréquence, ce qui donne y(x,t) = A sin(ωt) cos(kx).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"A. y(x,t) = A sin(ωt) cos(kx)\", \"b\": \"B. y(x,t) = A sin(ωt + kx","_debug_options_count":4},{"id":27926,"question":"Vrai ou Faux ? La diffraction est un phénomène propre aux ondes mécaniques uniquement.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"b","explication":"La diffraction concerne toutes les ondes, qu'elles soient mécaniques (son, vagues) ou électromagnétiques (lumière).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"Vrai\", \"b\": \"Faux\", \"c\": \"\", \"d\": \"\"}}","_debug_options_count":4},{"id":27927,"question":"Quelle est l'unité SI de la fréquence ?","option_a":"A. Hertz (Hz)","option_b":"B. Seconde (s)","option_c":"C. Mètre (m)","option_d":"D. Newton (N)","option_e":"","option_f":"","bonne_reponse":"a","explication":"La fréquence s'exprime en Hertz (Hz), équivalent à s⁻¹.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"A. Hertz (Hz)\", \"b\": \"B. Seconde (s)\", \"c\": \"C. Mètre (m)\", \"d\":","_debug_options_count":4},{"id":27928,"question":"Vrai ou Faux ? Une onde transversale se propage perpendiculairement à la direction de vibration.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"Dans une onde transversale, la direction de propagation est perpendiculaire à la direction de vibration (ex : vague, onde électromagnétique).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"Vrai\", \"b\": \"Faux\", \"c\": \"\", \"d\": \"\"}}","_debug_options_count":4},{"id":27929,"question":"Quelle relation lie la célérité v, la longueur d'onde λ et la période T d'une onde ?","option_a":"A. v = λ \/ T","option_b":"B. v = T \/ λ","option_c":"C. v = λ × T","option_d":"D. v = T + λ","option_e":"","option_f":"","bonne_reponse":"a","explication":"La célérité est égale à la longueur d'onde divisée par la période : v = λ \/ T.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"A. v = λ \/ T\", \"b\": \"B. v = T \/ λ\", \"c\": \"C. v = λ × T\", \"d\":","_debug_options_count":4}]