Question

question 20 (1 point) half - life refers to spontaneous nuclear reactions such as bombardment true false question 21 (1 point) in electron capture, a proton and an electron combine to form a neutron true false question 22 (1 point) light has absolutely no mass, this is fact and not theory, and doesnt have to be tested true false

Explanation:

Question 20:

Half - life is the time required for half of the nuclei in a radioactive sample to decay. It is related to spontaneous radioactive decay, not nuclear reactions like bombardment which are induced reactions.

Question 21:

In electron capture, a proton in the nucleus combines with an inner - shell electron to form a neutron.

Question 22:

Light has no rest mass. This is a well - established fact in physics based on theory and experimental evidence.

Answer:

Question 20: B. False
Question 21: A. True
Question 22: A. True