Question

# What are infrared radiations ? How are they detected ? State one use of these radiations.

Solution

## Infrared radiations are the electromagnetic waves of wavelength in the range of $$8000$$ Å to $$10^7$$ Å .$$Detection$$ : If a thermometer with a blackened bulb is moved from the violet end towards the red end, it is observed that there is a slow rise in temperature , but when it is moved beyond the red region, a  rapid rise in temperature is noticed. It means that the portion of spectrum beyond the red end has certain radiations which produce a strong heating effect , but they are not visible. These radiations are called the infrared radiations.$$Use$$ : The infrared radiations are used for therapeutic purpose by doctors and in satellite communication ..Physics

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