Question

Waves of which frequency can penetrate the atmosphere?

(a) higher than 10 MHz

(b) higher than 20 MHz

(c) higher than 30 MHz

(d) higher than 100 MHz

I got this question by my school principal while I was bunking the class.

My question comes from Carrier Acquistion Techniques in DSB-SC topic in section Double Sideband Suppressed Carrier Modulation of Analog Communications

Answer 1

The correct answer is (c) higher than 30 MHz

Explanation: Most Radio Waves penetrate the atmosphere.  Thus, any wave having frequency greater than 30 MHz can penetrate the atmosphere. The waves having frequency less than it cannot penetrate the atmosphere and get absorbed into it.