In earth's atmosphere , for `F_(2)` - layer, the virtual height and critical frequency in night time are

In earth's atmosphere for F_(1) -layer , the virutal height and critical frequency are

In earth's atmosphere for E- layer , the virtual height and critical frequency are

F_(2) - layer of eath's atmosphere is at a vertical height of about ……….. km in night time and about …….. in day time .

Maximum usable frequency (MUF) in F-region layer is x, when the critical frequency is 60 MHz and the angle of incidence is 70^(@) , then x is

Maximum usable frequency ( MUF ) in F -region layer is x , when the critical frequency is 60 MHz and the angle of incidence is 60^(@) . Then x is

The electron density of a layer of ionosphere at a height 150 km from the earth's surface is 9 × 109 per m3. For the sky transmission from this layer up to a range of 250 km, The critical frequency of the layer is

Height h(400=m) from the ground at place A, from which the readiowaves can be transmitted. There is a receive at station B on earth at a distance d(=125km), which can receive the signal from station A. The radiowaves can reach the station B, either through earth's atmosphere or through satellite. There are four main layers in earth's atmosphere named D,E, F_(1) and F_(2) which play effective role in radio communication. The electron density of these layers is 4xx10^(8), 2xx10^(11),5xx10^(11) and 8xx10^(11)m^(-3) . The radius of the earth is 6.4xx10^(6)m . The ratio of critical frequency for reflection of radiowaves from E, F_(1) and F_(2) layers in ionosphere of earth's atmosphere is