Quiz — radioactivité-rekik.pdf

Question 1 sur 10 20:00

[{"id":8495,"question":"Quel type de rayonnement est composé de noyaux d’hélium ?","option_a":"Rayonnement alpha","option_b":"Rayonnement bêta","option_c":"Rayonnement gamma","option_d":"Rayonnement X","option_e":"","option_f":"","bonne_reponse":"a","explication":"Le rayonnement alpha est constitué de noyaux d’hélium (2 protons et 2 neutrons), émis lors de la désintégration de noyaux lourds.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"Rayonnement alpha\", \"b\": \"Rayonnement bêta\", \"c\": \"Rayonnement g","_debug_options_count":4},{"id":8496,"question":"La demi-vie d’un isotope radioactif est de 5 ans. Après 15 ans, quelle fraction de l’échantillon initial reste-t-il ?","option_a":"1\/2","option_b":"1\/4","option_c":"1\/8","option_d":"1\/16","option_e":"","option_f":"","bonne_reponse":"c","explication":"Après 15 ans (3 demi-vies), il reste (1\/2)^3 = 1\/8 de l’échantillon initial.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"c\", \"options\": {\"a\": \"1\/2\", \"b\": \"1\/4\", \"c\": \"1\/8\", \"d\": \"1\/16\"}}","_debug_options_count":4},{"id":8497,"question":"Les rayonnements gamma sont-ils chargés électriquement ?","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"b","explication":"Les rayonnements gamma sont des photons (sans charge ni masse), contrairement aux rayonnements alpha et bêta.","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":8498,"question":"Quelle formule exprime la loi de décroissance radioactive ?","option_a":"N(t) = N0 × e^(-λt)","option_b":"N(t) = N0 × λt","option_c":"N(t) = N0 \/ t","option_d":"N(t) = N0 × t^2","option_e":"","option_f":"","bonne_reponse":"a","explication":"La loi de décroissance radioactive est N(t) = N0 × e^(-λt), où λ est la constante de désintégration.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"N(t) = N0 × e^(-λt)\", \"b\": \"N(t) = N0 × λt\", \"c\": \"N(t) = N0 ","_debug_options_count":4},{"id":8499,"question":"Un échantillon radioactif a une activité de 800 Bq. Après 2 demi-vies, quelle sera son activité ?","option_a":"200 Bq","option_b":"400 Bq","option_c":"100 Bq","option_d":"800 Bq","option_e":"","option_f":"","bonne_reponse":"a","explication":"Après 2 demi-vies, l’activité est divisée par 4 : 800 Bq \/ 4 = 200 Bq.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"200 Bq\", \"b\": \"400 Bq\", \"c\": \"100 Bq\", \"d\": \"800 Bq\"}}","_debug_options_count":4},{"id":8500,"question":"La radioactivité naturelle est-elle présente dans notre environnement quotidien ?","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"Oui, la radioactivité naturelle est présente dans les roches, l’air, l’eau et même dans notre corps (ex : potassium-40).","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":8501,"question":"Quel isotope est couramment utilisé en médecine pour les scintigraphies ?","option_a":"Uranium-235","option_b":"Iode-131","option_c":"Carbone-14","option_d":"Plutonium-239","option_e":"","option_f":"","bonne_reponse":"b","explication":"L’iode-131 est utilisé en médecine nucléaire pour diagnostiquer et traiter des troubles thyroïdiens.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"Uranium-235\", \"b\": \"Iode-131\", \"c\": \"Carbone-14\", \"d\": \"Plutonium","_debug_options_count":4},{"id":8502,"question":"La constante de désintégration λ dépend-elle de la température ?","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"b","explication":"La constante de désintégration λ est une propriété intrinsèque du noyau et ne dépend pas des conditions extérieures comme la température.","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":8503,"question":"Quelle est l’unité de mesure de l’énergie des rayonnements ionisants ?","option_a":"Joule","option_b":"Électronvolt (eV)","option_c":"Watt","option_d":"Newton","option_e":"","option_f":"","bonne_reponse":"b","explication":"L’énergie des rayonnements ionisants est mesurée en électronvolts (eV), où 1 eV = 1,6 × 10^-19 joules.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"Joule\", \"b\": \"Électronvolt (eV)\", \"c\": \"Watt\", \"d\": \"Newton\"}}","_debug_options_count":4},{"id":8504,"question":"Un détecteur de radioactivité mesure 150 impulsions par minute. Sachant que le bruit de fond est de 30 impulsions\/min, quelle est l’activité réelle de la source ?","option_a":"120 impulsions\/min","option_b":"180 impulsions\/min","option_c":"150 impulsions\/min","option_d":"30 impulsions\/min","option_e":"","option_f":"","bonne_reponse":"a","explication":"L’activité réelle est obtenue en soustrayant le bruit de fond : 150 - 30 = 120 impulsions\/min.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"120 impulsions\/min\", \"b\": \"180 impulsions\/min\", \"c\": \"150 impulsi","_debug_options_count":4}]