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प्रश्न
Mention three properties of infrared radiations similar to the visible light.
उत्तर
- Infrared radiation travels in a straight line as light does, with a speed equal to 3 × 108 m/s in a vacuum.
- They obey the laws of reflection and refraction.
- They do not cause fluorescence on zinc sulphide screens.
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संबंधित प्रश्न
Give two such properties of infrared radiations which are not true for visible light.
Give reason for the following:
Infrared radiations are used for photography in fog.
Give reason for the following:
Infrared radiations are used as signals during war.
Give reason for the following:
A rock salt prism is used instead of a glass prism to obtain the infrared spectrum.
A radiation P is focused by a proper device on the bulb of a thermometer. Mercury in the thermometer shows a rapid increase. The radiation P is ______.
Name the material prism required for obtaining the spectrum of infrared radiation.
How can the presence of infrared Radiations be detected?
Name the radiations that are used for photography at night.
Assertion (A): Infrared radiations travel long distance through a dense fog and mist.
Reason (R): Infrared radiations undergo minimal scattering in earth's atmosphere.
State one harmful effect of the infrared radiation.
