Quiz — Hamdi - Ondes progressives 2.pdf

Question 1 sur 10 20:00

[{"id":19179,"question":"Quelle grandeur physique représente la distance entre deux points consécutifs en phase sur une onde ?","option_a":"A. Fréquence","option_b":"B. Longueur d'onde","option_c":"C. Amplitude","option_d":"D. Période","option_e":"","option_f":"","bonne_reponse":"b","explication":"La longueur d'onde (λ) est la distance entre deux points consécutifs en phase, comme deux crêtes ou deux creux.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"A. Fréquence\", \"b\": \"B. Longueur d'onde\", \"c\": \"C. Amplitude\", \"","_debug_options_count":4},{"id":19180,"question":"Une onde sonore se propage plus rapidement dans l'air que dans l'eau.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"b","explication":"Les ondes sonores se propagent plus rapidement dans les milieux denses comme l'eau que dans l'air, car les molécules sont plus proches.","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":19181,"question":"Quelle relation lie la célérité (v), la longueur d'onde (λ) et la fréquence (f) 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":"b","explication":"La célérité d'une onde se calcule avec la formule v = λ × f, où λ est 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\": \"A. v = λ \/ f\", \"b\": \"B. v = λ × f\", \"c\": \"C. v = f \/ λ\", \"d\":","_debug_options_count":4},{"id":19182,"question":"Les ondes électromagnétiques peuvent 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":19183,"question":"Quelle est l'unité de la fréquence dans le système international ?","option_a":"A. Hertz (Hz)","option_b":"B. Mètre (m)","option_c":"C. Seconde (s)","option_d":"D. Joule (J)","option_e":"","option_f":"","bonne_reponse":"a","explication":"La fréquence est mesurée en Hertz (Hz), qui correspond à une oscillation par 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\": \"A. Hertz (Hz)\", \"b\": \"B. Mètre (m)\", \"c\": \"C. Seconde (s)\", \"d\":","_debug_options_count":4},{"id":19184,"question":"Une onde sinusoïdale a une amplitude de 5 cm. Que représente cette amplitude ?","option_a":"A. La distance entre deux crêtes","option_b":"B. La distance maximale entre la position d'équilibre et un point de l'onde","option_c":"C. La période de l'onde","option_d":"D. La célérité de l'onde","option_e":"","option_f":"","bonne_reponse":"b","explication":"L'amplitude d'une onde sinusoïdale représente la distance maximale entre la position d'équilibre et un point de l'onde, ici 5 cm.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"A. La distance entre deux crêtes\", \"b\": \"B. La distance maximale","_debug_options_count":4},{"id":19185,"question":"La période (T) d'une onde est de 0,2 s. Quelle est sa fréquence (f) ?","option_a":"A. 0,2 Hz","option_b":"B. 5 Hz","option_c":"C. 2 Hz","option_d":"D. 0,04 Hz","option_e":"","option_f":"","bonne_reponse":"b","explication":"La fréquence (f) est l'inverse de la période : f = 1 \/ T = 1 \/ 0,2 = 5 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\": \"A. 0,2 Hz\", \"b\": \"B. 5 Hz\", \"c\": \"C. 2 Hz\", \"d\": \"D. 0,04 Hz\"}}","_debug_options_count":4},{"id":19186,"question":"Les ondes sonores sont des ondes transversales.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"b","explication":"Les ondes sonores sont des ondes longitudinales, 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":19187,"question":"Quelle est la célérité d'une onde dont la longueur d'onde est de 2 m et la fréquence de 100 Hz ?","option_a":"A. 50 m\/s","option_b":"B. 200 m\/s","option_c":"C. 102 m\/s","option_d":"D. 20 m\/s","option_e":"","option_f":"","bonne_reponse":"b","explication":"La célérité se calcule avec v = λ × f = 2 m × 100 Hz = 200 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\": \"A. 50 m\/s\", \"b\": \"B. 200 m\/s\", \"c\": \"C. 102 m\/s\", \"d\": \"D. 20 m\/s","_debug_options_count":4},{"id":19188,"question":"Une onde lumineuse a une fréquence de 5 × 10^14 Hz. Quelle est sa longueur d'onde dans le vide ? (célérité de la lumière : 3 × 10^8 m\/s)","option_a":"A. 600 nm","option_b":"B. 500 nm","option_c":"C. 700 nm","option_d":"D. 400 nm","option_e":"","option_f":"","bonne_reponse":"a","explication":"La longueur d'onde λ = c \/ f = (3 × 10^8 m\/s) \/ (5 × 10^14 Hz) = 6 × 10^-7 m = 600 nm.","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. 600 nm\", \"b\": \"B. 500 nm\", \"c\": \"C. 700 nm\", \"d\": \"D. 400 nm\"}","_debug_options_count":4}]