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