Quiz — Hamdi - Ondes progressives le long d_une corde.pdf

Question 1 sur 10 20:00

[{"id":11423,"question":"Quelle grandeur physique reste constante lors de la propagation d'une onde progressive sur une corde ?","option_a":"L'amplitude","option_b":"La fréquence","option_c":"La vitesse","option_d":"La longueur d'onde","option_e":"","option_f":"","bonne_reponse":"b","explication":"La fréquence est une propriété intrinsèque de la source et ne dépend pas du milieu de 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\": \"L'amplitude\", \"b\": \"La fréquence\", \"c\": \"La vitesse\", \"d\": \"La l","_debug_options_count":4},{"id":11424,"question":"Si la longueur d'onde d'une onde sur une corde est de 2 m et sa fréquence de 50 Hz, quelle est sa vitesse de propagation ?","option_a":"25 m\/s","option_b":"100 m\/s","option_c":"50 m\/s","option_d":"200 m\/s","option_e":"","option_f":"","bonne_reponse":"b","explication":"v = λ × f = 2 m × 50 Hz = 100 m\/s.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"25 m\/s\", \"b\": \"100 m\/s\", \"c\": \"50 m\/s\", \"d\": \"200 m\/s\"}}","_debug_options_count":4},{"id":11425,"question":"Vrai ou Faux : Une onde progressive transporte de la matière.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"b","explication":"Une onde progressive transporte de l'énergie et une perturbation, mais pas de matière.","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":11426,"question":"Quel paramètre influence directement la vitesse d'une onde sur une corde ?","option_a":"L'amplitude","option_b":"La tension de la corde","option_c":"La couleur de la corde","option_d":"La température ambiante","option_e":"","option_f":"","bonne_reponse":"b","explication":"La vitesse dépend de la tension T et de la masse linéique μ : v = √(T\/μ).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"L'amplitude\", \"b\": \"La tension de la corde\", \"c\": \"La couleur de ","_debug_options_count":4},{"id":11427,"question":"Si la période d'une onde est de 0,02 s, quelle est sa fréquence ?","option_a":"20 Hz","option_b":"50 Hz","option_c":"0,02 Hz","option_d":"2 Hz","option_e":"","option_f":"","bonne_reponse":"a","explication":"f = 1\/T = 1\/0,02 = 50 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\": \"20 Hz\", \"b\": \"50 Hz\", \"c\": \"0,02 Hz\", \"d\": \"2 Hz\"}}","_debug_options_count":4},{"id":11428,"question":"Vrai ou Faux : La longueur d'onde est inversement proportionnelle à la fréquence.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"λ = v\/f, donc λ est inversement proportionnelle à f si v est constante.","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":11429,"question":"Quelle relation lie la vitesse, la longueur d'onde et la fréquence d'une onde progressive ?","option_a":"v = λ × f","option_b":"v = λ \/ f","option_c":"v = f \/ λ","option_d":"v = λ + f","option_e":"","option_f":"","bonne_reponse":"a","explication":"La relation fondamentale est 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\": \"v = λ × f\", \"b\": \"v = λ \/ f\", \"c\": \"v = f \/ λ\", \"d\": \"v = λ ","_debug_options_count":4},{"id":11430,"question":"Si on double la tension d'une corde, comment évolue la vitesse des ondes ?","option_a":"Elle reste la même","option_b":"Elle double","option_c":"Elle est multipliée par √2","option_d":"Elle est divisée par 2","option_e":"","option_f":"","bonne_reponse":"c","explication":"v = √(T\/μ), donc si T est multiplié par 2, v est multiplié par √2.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"c\", \"options\": {\"a\": \"Elle reste la même\", \"b\": \"Elle double\", \"c\": \"Elle est multipli","_debug_options_count":4},{"id":11431,"question":"Vrai ou Faux : L'amplitude d'une onde progressive diminue lors de sa propagation.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"L'amplitude peut diminuer à cause des pertes d'énergie (amortissement), mais ce n'est pas une caractéristique intrinsèque de l'onde progressive.","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":11432,"question":"Quelle est l'unité SI de la longueur d'onde ?","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 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}]