(a) Give a list of at least five radiations, in the order of their increasing wavelength, which make up the complete electromagnetic spectrum.
(b) Name the radiation mentioned by you in part (a) which has the highest penetrating power.

Explanation

### Step-by-Step Solution

**(a)** To list at least five radiations in order of increasing wavelength, we need to understand the electromagnetic spectrum. The electromagnetic spectrum consists of various types of radiation, each with different wavelengths. Here is the list of five radiations in order of increasing wavelength:

1. **Gamma Rays** - These have the shortest wavelength and the highest energy.
2. **X-Rays** - These have slightly longer wavelengths than gamma rays.
3. **Ultraviolet (UV) Rays** - These have longer wavelengths than X-rays.
4. **Visible Light** - This is the range of electromagnetic radiation that can be detected by the human eye.
...