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For a radiation of 9 GHz passing through...

For a radiation of 9 GHz passing through air. The number of waves passing through 1 m length is

A

30

B

5

C

20

D

3

Text Solution

Verified by Experts

The correct Answer is:
A
`f = 9 GHz = 9 xx10 Hz`
`c = 3 x10^8` m/s
`lamda=c/f=(3xx10^8)/(9xx10^9)=(10^(-1))/3`m
Number of waves in a given length
`N=("length")/(lamda)=1/((10^(-1))/3)=30`
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