Physics Alternating Current PMDC Conceptual Practice
PMDC Verified Question 66 of 127
Which region of the electromagnetic spectrum is primarily used in radar systems and satellite telecommunication?
A
Ultraviolet rays
B
Microwaves
C
X-rays
D
Gamma rays
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Microwaves
Concept:

Microwaves (\(\lambda \approx 1\text{ mm to }30\text{ cm}\)) penetrate Earth's atmosphere without significant attenuation and travel in narrow directional beams, making them ideal for radar and satellite links.

Formula / Reaction:

$$f_{\text{microwaves}} \approx 1\text{ GHz to } 300\text{ GHz}$$

Solution:

  • Their short wavelength permits highly directional transmission by parabolic dish antennas with minimal atmospheric scattering.


Why other options are incorrect:

  • Opt_A, Opt_C, Opt_D: Highly ionizing radiations that are absorbed by the atmosphere and hazardous for communication.

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