Question

Assertion Short wave bands are used for transmission of radiowaves to a large distance.
Reason Short waves are reflected by atmosphere.

• A. If both Assertion and Reason are true and the Reason is correct explanation of the Assertion
• B. If both Assertion and Reason are true but Reason is not correct explanation of the Assertion
• C. If Assertion is true but Reason is false
• D. If Assertion is false but the Reason is true

Answer 1

Answer: (A)

Waves having the range of wavelength from $30\, km$ to $30\, cm$ are known as short waves. These waves are used for radio transmission and for general communication purpose to the longer distance from ionosphere. lonosphere is the outermost region of atmosphere extending from height of $80 km$ to $400\, km$ approx above the surface of the earth.