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Solution


Q.

Given below are two statement: one is labelled as Assertion A and the other is labelled as Reason R.                          [2023]

Assertion A: EM waves used for optical communication have longer wavelengths than that of microwave, employed in Radar technology.

Reason R: Infrared EM waves are more energetic than microwaves, (used in Radar)

In the light of given statements, choose the correct answer from the options given below:
1 A is false but R is true  
2 A is true but R is false  
3 Both A and R true but R is NOT the correct explanation of A  
4 Both A and R true and R is the correct explanation of A  

Ans.

(1)

Optical communication is performed in the frequency range of 1 THz to 1000 THz.

            (Microwave to UV)

So, EM waves used for optical communication have shorter wavelength than that of microwaves used in RADAR.

Also, νinfrared>νmicrowave

∴    Infrared EM waves are more energetic than microwave.