What is the correct order of radiations in descending order of frequencies?

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**Solution:**

1. The electromagnetic spectrum arranges radiations by frequency from highest to lowest as:
   - Gamma rays > X-rays > Ultraviolet > Visible light > Infrared > Microwaves > Radio waves

2. From the given options, the correct descending order of frequency among the listed radiations is:
   - X-rays > Infrared > Microwaves > Radio waves

3. This is because X-rays have much higher frequency than Infrared, which in turn is higher than Microwaves, and Radio waves have the lowest frequency among these.

**Answer:** X-rays > Infrared > Microwaves > Radio waves

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