[" The electron density of "E,F_(1),F_(2)" layers of iono."],[" sphere is "2times10^(11),5times10^(11)" and "8times10^(11)m^(-3)],[" respectively.What is the ratio ofcritical fre- "],[" quency for reflection of radio waves "]

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

The distance of two plenets from the sun are 10^(11) m and 10^(10) m respectively. What is the ratio of time period of these two planets ?

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 . 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 . 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 . 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

Electron number densities of a layer in the ionosphere and of just its upper layer are respectively 4 xx 10^(11) m^(-3) and 10^(12) m^(-3) . What would be the value of the critical angle at the interface of these two layers, for an upward motion of a radio wave of frequency 40 MHz.

The uncertainity in position and velocity of a particle are 10^(-11)m and 5.27times10^(-24)m//sec respectively.What is the minimum mass of the particle in kg .

Distance of two planets from the sun are 10^11 m and 10^(10) m respectively. Then find the ratio of time period of these two planets.