Final answer:
True statements about gamma radiation are that it has no charge (A) and it usually occurs with other types of radioactive decay (D). Gamma rays are high-energy electromagnetic radiation without mass, and they do not cause transmutation of elements.
Step-by-step explanation:
Gamma radiation, or gamma rays, have specific characteristics that define their nature. Let's assess the given statements:
- A. It has no charge. This is true; gamma rays are a type of electromagnetic radiation with no charge.
- B. It has a mass of 0.0005 amus. This is not true; gamma rays are energy and do not have mass.
- C. It causes transmutation. This is not true; gamma emission does not change the atomic number or mass number of an element, thus no transmutation occurs.
- D. It usually occurs with other types of radioactive decay. This is true; gamma emission often accompanies other types of decay, such as alpha or beta decay.
Therefore, the correct statements regarding gamma radiation are A and D.