The electron dencity of `E, F_(1),F_(2)` layers of ionosphere is `2xx10^(11), 5xx10^(11)` and `8xx10^(11) m^(-3)` respectively. Wht is the ratio of critical frequency for reflection of radiowaves?

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

If electron density of the layer of inosphere is 10 xx 10^(11) and k is a constant , then critical frequency for reflection of radiowaves 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 . On a particular day, the maximum frequency reflected from the ionosphere is 9 MHz. On another day, it was found to increase by 1 MHz. The ratio of maximum electrom density of the ionosphere on the two days 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 value of radio frequency at which the electromagnetic wave must be propagated for the D-layer of atmosphere to have a refractive index of 0.5 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 . If the frequency of the transmitting station is 5 MHz. and maximum number density of electrons in the ionosphere is 10^(-12)m^(-3) , state whether it is coming via

he maximum electron density in the ionosphere in the morning is 10^(10) m^(-3) At noon time, it increases to 2 xx 10^(10) m^(-3) . Find the ratio of critical frequency at noon and the critical frequency in the morning.

Find ratio of crictical frequency for reflection of radiowaves from E , F_(1) and F_(2) layers in ionosphere of earth's atmosphere having electron density 2 xx 10^(11) , 3 xx 10^(11) and 8 xx 10^(11) m^(-3) respectively.

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 . If the station A sends the T.V. signals, then the maximum area on earth upto which T.V. transmission can be received on earth is (average population density around the tower is 1000 km^(-2) )

The maximum electron density in the ionospherein the mornong is 10^(10)m^(-3) . At noon time it increases to 2xx10^(10)m^(-3) . Find the ratio of critical frequency at noon and the critical frequency in the morning.