Quiz — Spectres d’émission de l’atome d’hydrogène et de l.pdf

Question 1 sur 10 20:00

[{"id":34600,"question":"Dans le modèle de Bohr, quelle est l'énergie d'un électron sur le niveau n=2 de l'atome d'hydrogène ?","option_a":"-3,4 eV","option_b":"-13,6 eV","option_c":"-1,51 eV","option_d":"-0,85 eV","option_e":"","option_f":"","bonne_reponse":"a","explication":"L'énergie du niveau n=2 est donnée par E_n = -13,6\/n² eV. Pour n=2, E_2 = -13,6\/4 = -3,4 eV.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"-3,4 eV\", \"b\": \"-13,6 eV\", \"c\": \"-1,51 eV\", \"d\": \"-0,85 eV\"}}","_debug_options_count":4},{"id":34601,"question":"La série de Balmer correspond aux transitions électroniques vers le niveau n=1.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"b","explication":"La série de Balmer correspond aux transitions vers le niveau n=2, pas n=1. La série de Lyman correspond aux transitions vers n=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\": \"Vrai\", \"b\": \"Faux\", \"c\": \"\", \"d\": \"\"}}","_debug_options_count":4},{"id":34602,"question":"Quelle est la longueur d'onde de la raie Hα de la série de Balmer ?","option_a":"410 nm","option_b":"486 nm","option_c":"656 nm","option_d":"434 nm","option_e":"","option_f":"","bonne_reponse":"c","explication":"La raie Hα correspond à la transition n=3 → n=2. Sa longueur d'onde est calculée par λ = hc\/ΔE ≈ 656 nm.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"c\", \"options\": {\"a\": \"410 nm\", \"b\": \"486 nm\", \"c\": \"656 nm\", \"d\": \"434 nm\"}}","_debug_options_count":4},{"id":34603,"question":"Le spectre d'émission de l'hydrogène est un spectre continu.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"b","explication":"Le spectre d'émission de l'hydrogène est un spectre de raies, car les transitions électroniques se font entre niveaux d'énergie discrets.","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":34604,"question":"Quelle formule relie la longueur d'onde d'une raie spectrale à la transition électronique ?","option_a":"λ = hc\/ΔE","option_b":"λ = ΔE\/(hc)","option_c":"λ = hΔE\/c","option_d":"λ = c\/(hΔE)","option_e":"","option_f":"","bonne_reponse":"a","explication":"La formule correcte est λ = hc\/ΔE, où h est la constante de Planck, c la vitesse de la lumière et ΔE la différence d'énergie entre les niveaux.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"λ = hc\/ΔE\", \"b\": \"λ = ΔE\/(hc)\", \"c\": \"λ = hΔE\/c\", \"d\": \"λ ","_debug_options_count":4},{"id":34605,"question":"La série de Paschen correspond aux transitions vers le niveau n=3.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"La série de Paschen correspond bien aux transitions vers le niveau n=3, ce qui est correct.","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":34606,"question":"Quelle est l'énergie libérée lors de la transition d'un électron du niveau n=4 au niveau n=2 ?","option_a":"2,55 eV","option_b":"1,89 eV","option_c":"3,40 eV","option_d":"0,66 eV","option_e":"","option_f":"","bonne_reponse":"a","explication":"L'énergie libérée est ΔE = E_4 - E_2 = (-13,6\/16) - (-13,6\/4) = 2,55 eV.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"2,55 eV\", \"b\": \"1,89 eV\", \"c\": \"3,40 eV\", \"d\": \"0,66 eV\"}}","_debug_options_count":4},{"id":34607,"question":"Le modèle de Bohr est valable pour tous les atomes.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"b","explication":"Le modèle de Bohr est spécifique à l'atome d'hydrogène ou aux ions hydrogénoïdes (un seul électron). Il ne s'applique pas aux atomes polyélectroniques.","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":34608,"question":"Quelle série spectrale est située dans le domaine visible du spectre électromagnétique ?","option_a":"Lyman","option_b":"Balmer","option_c":"Paschen","option_d":"Brackett","option_e":"","option_f":"","bonne_reponse":"b","explication":"La série de Balmer correspond aux transitions vers n=2 et se situe dans le domaine visible (400-700 nm).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"Lyman\", \"b\": \"Balmer\", \"c\": \"Paschen\", \"d\": \"Brackett\"}}","_debug_options_count":4},{"id":34609,"question":"La constante de Rydberg permet de calculer les longueurs d'onde des raies spectrales.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"La constante de Rydberg (R_H) est utilisée dans la formule 1\/λ = R_H (1\/n₁² - 1\/n₂²) pour calculer les longueurs d'onde des raies spectrales.","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}]