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Question

A radiation X is focused on the bulb of a thermometer. Mercury in the thermometer shows a rapid increase. The radiation X is
  1. Visible light
  2. Ultraviolet radiation
  3. X - rays
  4. Infrared radiation


Solution

The correct option is D Infrared radiation
Infrared is the invisible portion of electromagnetic spectrum, which can produce heating effect. But visible light is also capable of heating effect.

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