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Infrared radiations and Ultra Violet radiations:
What are infrared radiations and Ultra Violet radiations?
Ans: Infrared:
Wavelengths larger than visible light
2. Wavelengths range from 0.7mm to 100 mm
3. Used in physiotherapy
Ultra Violet:
1. Wavelengths shorter than visible light
2. Wavelengths range from 0.4 mm to 1 nm
3. Long exposure of body to UV rays causes skin diseases
An experiment with force and motion Tie a spring clothes peg open by placing one winding of thread about the long ends. Place the clothes peg in the centre of a long table and
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