Name the following electromagnetic waves and arrange them in decreasing order of their wavelength: (a) Electromagnetic waves which are used for sterilizing surgical equipments
(b) Electromagnetic waves which are emitted from the nuclei of radioactive atoms
(c) Electromagnetic waves which are used by FM radio station for broadcasting
(d) Electromagnetic waves which are produced when fast moving electrons are stopped by a heavy metal target.

Explanation

To solve the question, we need to identify the electromagnetic waves corresponding to each description and then arrange them in decreasing order of their wavelength.

### Step-by-Step Solution:

1. **Identify the Electromagnetic Waves:**
- (a) Electromagnetic waves used for sterilizing surgical equipment: **Ultraviolet (UV) rays**
- (b) Electromagnetic waves emitted from the nuclei of radioactive atoms: **Gamma rays**
- (c) Electromagnetic waves used by FM radio stations for broadcasting: **Radio waves**
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