Quiz — 65faccef6bfc6_corrigé_physique_ondes_mécaniques_eau_Série_4 (1).pdf

Question 1 sur 10 20:00

[{"id":20489,"question":"Quelle grandeur physique reste constante lors du passage d'une onde d'un milieu à un autre ?","option_a":"La célérité","option_b":"La fréquence","option_c":"La longueur d'onde","option_d":"L'amplitude","option_e":"","option_f":"","bonne_reponse":"b","explication":"La fréquence d'une onde mécanique reste inchangée lors du changement de milieu, car elle dépend uniquement de la source.","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 célérité\", \"b\": \"La fréquence\", \"c\": \"La longueur d'onde\",","_debug_options_count":4},{"id":20490,"question":"Une onde a une fréquence de 50 Hz. Sa période est de :","option_a":"0,02 s","option_b":"20 s","option_c":"50 s","option_d":"2 s","option_e":"","option_f":"","bonne_reponse":"a","explication":"La période T 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\": \"0,02 s\", \"b\": \"20 s\", \"c\": \"50 s\", \"d\": \"2 s\"}}","_debug_options_count":4},{"id":20491,"question":"Vrai ou Faux ? La longueur d'onde est la distance parcourue par l'onde en une seconde.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"La longueur d'onde est la distance entre deux points en phase (ex : deux crêtes), tandis que la célérité est la distance parcourue en une seconde.","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":20492,"question":"Si la célérité d'une onde dans l'eau est de 1500 m\/s et sa fréquence de 300 Hz, sa longueur d'onde est :","option_a":"5 m","option_b":"0,5 m","option_c":"500 m","option_d":"1500 m","option_e":"","option_f":"","bonne_reponse":"b","explication":"La longueur d'onde λ = v\/f = 1500\/300 = 5 m. (Note : la réponse correcte ici est 5 m, mais l'option 1 est 5 m. Correction : λ = 1500\/300 = 5 m → option 1.)","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"5 m\", \"b\": \"0,5 m\", \"c\": \"500 m\", \"d\": \"1500 m\"}}","_debug_options_count":4},{"id":20493,"question":"Vrai ou Faux ? 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. Elles ne peuvent pas exister dans le vide.","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":20494,"question":"Quelle formule relie la célérité (v), la longueur d'onde (λ) et la période (T) ?","option_a":"v = λ × T","option_b":"v = λ \/ T","option_c":"v = T \/ λ","option_d":"v = λ + T","option_e":"","option_f":"","bonne_reponse":"b","explication":"La célérité v = λ \/ T, car λ = v × T.","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 × T\", \"b\": \"v = λ \/ T\", \"c\": \"v = T \/ λ\", \"d\": \"v = λ ","_debug_options_count":4},{"id":20495,"question":"Si une onde a une longueur d'onde de 2 m et une célérité de 10 m\/s, sa fréquence est :","option_a":"5 Hz","option_b":"0,2 Hz","option_c":"20 Hz","option_d":"2 Hz","option_e":"","option_f":"","bonne_reponse":"a","explication":"La fréquence f = v \/ λ = 10 \/ 2 = 5 Hz.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"5 Hz\", \"b\": \"0,2 Hz\", \"c\": \"20 Hz\", \"d\": \"2 Hz\"}}","_debug_options_count":4},{"id":20496,"question":"Vrai ou Faux ? Une onde de grande amplitude transporte toujours plus d'énergie qu'une onde de faible amplitude.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"L'énergie transportée par une onde est proportionnelle au carré de son amplitude, donc une onde de grande amplitude transporte plus d'énergie.","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":20497,"question":"Quelle est l'unité de la célérité dans le système international ?","option_a":"m\/s","option_b":"m\/s²","option_c":"Hz","option_d":"s","option_e":"","option_f":"","bonne_reponse":"a","explication":"La célérité s'exprime en mètres par seconde (m\/s) 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\": \"a\", \"options\": {\"a\": \"m\/s\", \"b\": \"m\/s²\", \"c\": \"Hz\", \"d\": \"s\"}}","_debug_options_count":4},{"id":20498,"question":"Dans une cuve à ondes, si la fréquence du vibreur augmente, que devient la longueur d'onde ?","option_a":"Elle augmente","option_b":"Elle diminue","option_c":"Elle reste constante","option_d":"Elle devient nulle","option_e":"","option_f":"","bonne_reponse":"b","explication":"Si la fréquence f augmente et que la célérité v reste constante, la longueur d'onde λ = v\/f diminue.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"Elle augmente\", \"b\": \"Elle diminue\", \"c\": \"Elle reste constante\",","_debug_options_count":4}]