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  • Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R Assertion A : EM waves used for optical communication have longer wa

Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R

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.

Option: 1

A is true but R is false


Option: 2

Both A and R are true and r is the correct explanation of A


Option: 3

A is false but R is true


Option: 4

Both A and R are true but R is NOT the correct explanation of A


Answers (1)

best_answer

Optical communication is performed in the frequency range of  1 \ \mathrm{THz} \ \ to \ \ 1000 \ \ \mathrm{THz}. (Microwave to UV)

So, EM waves used for optical communication have a shorter wavelength than that of microwaves used in RADAR.
Also, v_{\text {INFRARED }}>v_{\text {MICROWAVE }}
  Therefore Infrared EM waves are more energetic than microwaves.

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