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A source S and a detector D high frequen...

A source `S` and a detector `D` high frequency waves are a distance `d` apart on the ground. The direct wave from `S` is found to be in phase at `D` with the wave from `S` that is reflected from horizontal layer at an altitude `H`. The incident and reflected rayes make the same angle with the reflecting layer. When the layer rises a distance `h`, no signal is detected at `D` . Negle ct absorption in the atmosphere and find the relation between d,h, `H` and the wavelength `lambda` of the waves.

A

absorbed by F layer

B

reflected by the E layer

C

capable of use for long distance transmission

D

affected by the solar cycle

Text Solution

Verified by Experts

The correct Answer is:
B
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