Question

Which of the following layer disappears during night time in ionosphere?

(a) D layer

(b) E- layer

(c) F1 layer

(d) F2 layer

This question was addressed to me at a job interview.

I need to ask this question from Radio Wave Propagation topic in division Radio Wave Propagation of Antennas

Answer 1

Right choice is (a) D layer

To elaborate: During night time D layer disappears and F1, F2 layers combine together to form an F layer. D layer is present at 70km from the earth surface and is the nearest layer to earth surface. E layer lies at 110km, f1 layer at 220km and F2 at 250 to 400km.