Home
Class 12
PHYSICS
For sky wave propagation of a 10MHz sign...

For sky wave propagation of a 10MHz signal, what should be the minimum electron density in lonosphere?

A

`~1.2xx10^(12)m^(-3)`

B

`~10^(6)m^(-1)`

C

`~10^(14)m^(-3)`

D

`~10^(22) m^(-3)`

Text Solution

Verified by Experts

The correct Answer is:
A
The critical frequency of a sky wave for reflection from a layer of atmosphere is given by `f_(c)=9(N_("max"))^(1//2)`
where N is the density of electron `"/"M^(3)`.
`10xx10^(6)=9(N_("max"))^(1//2)`
`N_("max")=((10xx10^(6))/(9))^(2)cong 1.2xx10^(12) m^(-3)`.
Promotional Banner

Similar Questions

Explore conceptually related problems

For sky wave propagation of a 10 MHz signal, what should be the minimum electron density in ionosphere?

Sky wave propagation is used in

On a particular day, the maximum frequency reflected from the ionosphere is 10 MHz. On another day, it was found to increase to 11 MHz. Calculate the ratio of the maximum electron densities of the ionosphere on the two days. Point out a plausible explanation for this.

On a particular day, the maximum frequency reflected from the ionosphere is 10 MHz. On another day, it was found to increase to 11 MHz. Calculate the ratio of the maximum electron densities of the ionosphere on the two days. Point out a plausible explanation for this.

On a particular day, the maximum frequency reflected from the ionosphere is 10 MHz The maximum electron density in ionosphere is

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 . Calculate , the ratio of the maximum electron densities of the ionosphere on the two days .

For propagation of sound waves through a medium, the medium should posses :

The sky wave propagation is suitable for radiowaves of frequency

The sky wave propagation is suitable for radio waves of frequency

Short wave propagation of radio waves consists of freqeuncies which are reflected by ionosphere. Some important technical terms are defined related to the free electron density N of layers and the frequencies v to be reflected are mentioned in Column-I. They are related to frequency v and free electron density N as shown in Column-II