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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 one use of infrared radiations.
What are infrared radiations?
Give reason for the following:
Infrared radiations are used for photography in fog.
Give reason for the following:
The photographic darkrooms are provided with infrared lamps.
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 radiations which are absorbed by the green house gases in the earth's atmosphere.
Infrared radiations are used in warfare. Explain with reason, why?
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.
