1. Radioactivity * A. is spontaneous B. involves change in nuclear shape C. none of the above D. is a thermodynamic process 2. Which of the following about natural radioactivity is false? * A. It is spontaneous B. it involves mass-energy changes C.Its rate cannot be altered by temperature D. its rate is dependent on the chemical state of the material
choose the correct answer.
1. Radioactivity *
A. is spontaneous
B. involves change in nuclear shape
C. none of the above
D. is a
2. Which of the following about natural radioactivity is false? *
A. It is spontaneous
B. it involves mass-energy changes
C.Its rate cannot be altered by temperature
D. its rate is dependent on the chemical state of the material
3. Gamma rays have their origin in *
A. the excited states of orbital electrons
B. the collision between two nucleons in the nucleus
C. the excited states of the nuclei
D. the interactions between a nucleon and the orbital electrons
4. Which of the following has the least penetrating power? *
A. alpha particle
B. beta particle
C. gamma radiation
D. neutrino
5. Among the radiations, alpha, gamma, and X-ray, the one which can easily be stopped by paper is, *
A. X-ray
B. beta
C. alpha
D. gamma
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