Quiz — correction série 22-Les ondes (1).pdf

Question 1 sur 10 20:00

[{"id":11333,"question":"Quelle grandeur caractérise le nombre d'oscillations par seconde d'une onde ?","option_a":"La longueur d'onde","option_b":"La fréquence","option_c":"La célérité","option_d":"L'amplitude","option_e":"","option_f":"","bonne_reponse":"b","explication":"La fréquence (f) représente le nombre d'oscillations par seconde, mesurée en hertz (Hz).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"La longueur d'onde\", \"b\": \"La fréquence\", \"c\": \"La célérité\",","_debug_options_count":4},{"id":11334,"question":"Une onde mécanique peut se propager dans le vide.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"b","explication":"Les ondes mécaniques nécessitent un milieu matériel pour se propager (ex. : air, eau).","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":11335,"question":"Quelle relation lie la longueur d'onde (λ), la célérité (v) et la fréquence (f) d'une onde ?","option_a":"v = λ \/ f","option_b":"v = λ × f","option_c":"f = λ × v","option_d":"λ = v \/ f","option_e":"","option_f":"","bonne_reponse":"b","explication":"La relation est v = λ × f, où v est la célérité, λ la longueur d'onde et f la fréquence.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"v = λ \/ f\", \"b\": \"v = λ × f\", \"c\": \"f = λ × v\", \"d\": \"λ = v","_debug_options_count":4},{"id":11336,"question":"Le son est une onde transversale.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"b","explication":"Le son est une onde longitudinale, car la perturbation se fait dans la même direction que la propagation.","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":11337,"question":"Quelle est l'unité de mesure de la longueur d'onde dans le système international ?","option_a":"Hertz (Hz)","option_b":"Mètre (m)","option_c":"Seconde (s)","option_d":"Newton (N)","option_e":"","option_f":"","bonne_reponse":"b","explication":"La longueur d'onde (λ) s'exprime en mètres (m) dans le système international.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"Hertz (Hz)\", \"b\": \"Mètre (m)\", \"c\": \"Seconde (s)\", \"d\": \"Newton ","_debug_options_count":4},{"id":11338,"question":"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) peuvent se propager dans le vide, contrairement aux ondes mécaniques.","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":11339,"question":"Quelle grandeur physique reste constante lors du passage d'une onde d'un milieu à un autre ?","option_a":"La fréquence","option_b":"La célérité","option_c":"La longueur d'onde","option_d":"L'amplitude","option_e":"","option_f":"","bonne_reponse":"a","explication":"La fréquence (f) reste constante lors du changement de milieu, car elle dépend de la source.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"La fréquence\", \"b\": \"La célérité\", \"c\": \"La longueur d'onde\",","_debug_options_count":4},{"id":11340,"question":"Le phénomène de diffraction est observable uniquement pour les ondes lumineuses.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"b","explication":"La diffraction est observable pour toutes les ondes (sonores, lumineuses, etc.) lorsque la taille de l'obstacle est comparable à la longueur d'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":11341,"question":"Quelle est la relation entre la période (T) et la fréquence (f) d'une onde ?","option_a":"T = 1 \/ f","option_b":"T = f","option_c":"T = f × 2π","option_d":"T = λ \/ v","option_e":"","option_f":"","bonne_reponse":"a","explication":"La période (T) est l'inverse de la fréquence : T = 1 \/ 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\": \"T = 1 \/ f\", \"b\": \"T = f\", \"c\": \"T = f × 2π\", \"d\": \"T = λ \/ v\"}","_debug_options_count":4},{"id":11342,"question":"Une onde stationnaire est le résultat de la superposition de deux ondes de même amplitude et de même fréquence se propageant en sens inverse.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"Une onde stationnaire est bien le résultat de cette superposition, créant des points fixes appelés nœuds et ventres.","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}]