tailieunhanh - physics_test_bank_split_43

Tham khảo tài liệu 'physics_test_bank_split_43', khoa học tự nhiên, vật lý phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Simpo PDF Merge and Split Unregistered Version - http 39. The half-life of a radioactive isotope is 140 days. In how many days does the decay rate of a sample of this isotope decrease to one-fourth of its initial decay rate A. 35 B. 105 C. 187 D. 210 E. 280 ans E 40. Of the three common types of radiation alpha beta gamma from radioactive sources electric charge is carried by A. only beta and gamma B. only beta C. only alpha and gamma D. only alpha E. only alpha and beta ans E 41. An alpha particle is A. a helium atom with two electrons removed B. an aggregate of two or more electrons C. a hydrogen atom D. the ultimate unit of positive charge E. sometimes negatively charged ans A 42. A nucleus with mass number A and atomic number Z emits an alpha particle. The mass number and atomic number respectively of the daughter nucleus are A. A Z - 2 B. A - 2 Z - 2 C. A - 2 Z D. A - 4 Z E. A - 4 Z - 2 ans E 43. Radioactive polonium 214Po Z 84 decays by alpha emission to A. 214Po Z 84 B. 210Pb Z 82 C. 214At Z 85 D. 218Po z 84 E. 210Bi Z 83 ans B Chapter 42 NUCLEAR PHYSICS 631 Simpo PDF Merge and Split Unregistered Version - http 44. A radium atom 226Ra Z 86 emits an alpha particle. The number of protons in the resulting atom is A. 84 B. 85 C. 86 D. 88 E. some other number ans A 45. Some alpha emitters have longer half-lives than others because A. their alpha particles have greater mass B. their alpha particles have less mass C. their barriers to decay are higher and wider D. their barriers to decay are lower and narrower E. their decays include the emission of a photon ans C 46. In an alpha decay the disintegration energy appears chiefly as A. photon energies B. the kinetic energies of the alpha and the daughter nucleus C. the excitation energy of the daughter nucleus D. the excitation energy of the alpha particle E. heat ans B 47. Rank the following collections of particles according to the total binding energy of all the particles in each .