Question

Electromagnetic waves with wavelength

(i) λ₁ is used in satellite communication. 

(ii) λ₂ is used to kill germs in water purifiers. 

(iii) λ₃ is used to detect leakage of oil in underground pipe lines. 

(iv) λ₄ is used to improve visibility in runways during fog and mist condition. 

(a) Identify and name the part of EM spectrum to which these radiation belong. 

(b) Arrange them in the ascending order of their wavelength magnitude. 

(c) Write one more application for each of them.

Answer 1

(a) λ₁ →  microwave 

λ₂ → ultraviolet radiation 

λ₃ → x–rays 

λ₄ → Infrared radiation

(b) λ₃ < λ₂ λ₄ <  λ₁

(c) λ₁ → microwaves - used in radar (or microwave oven). 

λ₂ → U-V radiation - used in LASIK eye surgery. 

λ₃ → x–rays - used in radio-graphy. 

λ₄ → infrared - used in remote controls.