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The phenomena involved in the reflection...

The phenomena involved in the reflection of radiowaves by ionosphere is similar to

A

reflection of light by a plane mirror

B

total internal reflection of light in air during a mirage

C

dispersion of light by water molecules during the formation of a rainbow

D

scattering of light by the particles of air

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The correct Answer is:
B
(b) The phenomenon involved in the reflection of radiowaves by ionosphere is smiliar to total internal reflection of light in air during a mirage i.e., angle of incidence is greater than critical angle.
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Assertion: In ionospheric reflection, phase change does not occurs with the light wave. Reason: The ionosphere reflection is similar to the tatol internal reflection is similar to the total internal reflection in miral.

The maximum fequency for reflection of sky waves from a certain layer of the ionosphere is found to be f_(max) =9(N_(max))^(1//2) , Where N _max is the maximum electron density at that layer of the ionosphere.On a certain day it is observed that signals of frequencies higher than 5 MHz are not received by reflection from the F_(1) layer of the ionosphere while signals of frequencies higher than 8 MHz are not received by reflection from the F_(2) layer of the ionosphere. Estimate the maximum electron densities of the F_(1) and F_(2) layers on that day.

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