A radiation X is focused by a particular device on the bulb of a thermometer and mercury in .the thermometer shows a rapid increase. Name the radiation X.

Explanation

To solve the question, we need to identify the type of radiation (X) that causes the mercury in a thermometer to show a rapid increase when focused on its bulb. Here’s a step-by-step solution:

### Step 1: Understand the Function of a Thermometer
A thermometer measures temperature by observing the expansion of a liquid (like mercury) in a glass tube. As the temperature increases, the liquid expands and rises in the tube.

**Hint:** Remember that thermometers are sensitive to temperature changes and the type of radiation can affect the temperature of the bulb.

### Step 2: Identify the Types of Radiation
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