[1 only] With reference to layers of ionsphere, consider the following statements :1. During day time, D

With reference to layers of ionsphere, consider the following statements :
1. During day time, D layer’s density is less compared to E and F layer.
2. High-frequency radiowaves are reflected from the D layer.
Which of the statements given above is/are correct ?

1 only

2 only

Both 1 and 2

Neither 1 nor 2

Explanation:
High-frequency radiowaves are reflected from the E layer. D layer is the lowest of the ionosphere layers, which absorbs the highest amount of harsh x-ray radiation. During the night, there is a minimal amount of ionization taking place. There is a high amount of energy dissipation because of rapid collisions of the ions. During day time all three- D, E and F layer are present, but D layer does not help in communication. This is because its density is greatly reduced. The D layer is normally not dense enough to reflect the radio waves. However, the E layer is, so the VLF signals go through the D layer, bounce off the E layer, and go back down through the D layer to the ground. The signals lose energy as they penetrate through the D layer and hence radios pick up weaker signals from the transmitter during the day.

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