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.

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Solution

The mercury in the thermometer increases when it is in contact with a hot object.
Infrared radiations release heat energy irrespective of the surrounding temperature.
So when the infrared radiation is focused by a particular device on the bulb of a thermometer, then the mercury in the thermometer shows a rapid increase.
Thus radiation X is infrared radiation.

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