Which phenomenon shows the particle nature of light?

The nucleus of an atom consists of:

The photoelectric effect proves that light has:

The smallest particle of an element that can take part in a chemical reaction is:

The mass number of an atom is the sum of:

The device used to accelerate charged particles is called a:

The unit of radioactivity is:

Which of the following particles has no charge?

The first artificial satellite was launched by:

Which of the following has the shortest wavelength?