Physics 222 Worksheet: Chapters 30 - 31, Nuclear Physics

1) Nuclei with the same atomic number but different mass number are

a) impossible.

b) always radioactive.

c) fissionable.

d) isotopes.

2) A nucleus of contains

a) 14 protons and 31 neutrons.

b) 31 protons and 14 neutrons.

c) 14 protons and 17 neutrons.

d) 17 protons and 14 neutrons.

3) An a and a b particle are accelerated through the same potential difference.

a) Both have the same kinetic energy but the a particle has the greater momentum.

b) Both have the same kinetic energy but the b particle has the greater momentum.

c) The a particle has greater kinetic energy and momentum than the b particle.

d) The a particle has greater kinetic energy but less momentum than the b particle.

e) Both have the same kinetic energy and momentum.

4) Neutrinos are associated with

a) a decay.

b) b decay.

c) g decay.

5) A freshly prepared sample of a radioactive substance consists of 128g. After 20 days only 8g remain. The half life is

a) 2.0 days.

b) 5.0 days.

c) 6.4 days.

d) 16 days.

e) 20 days.

6) A Geiger tube is used to:

a) measure radiation.

b) produce radiation.

c) block radiation.

7) The combination of light nuclei into a heavier one is called

a) radioactivity.

b) alpha decay.

c) fusion.

d) fission.

8) Complete the nuclear reactions: Give Z and A for isotopes; State a, b^±, g, n, p for particles.

Ans: 1-d, 2-c, 3-a, 4-b, 5-b, 6-a, 7-c, 8a-, 8b-, 8c-b⁺, 8d-n, 8e-, 8f-n