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The intensity of electromagnetic wave at...

The intensity of electromagnetic wave at a distance of `1 Km` from a source of power `12.56 Kw`. Is

A

`10^(-3)Wm^(-2)`

B

`4xx10^(-3)Wm^(-2)`

C

`12.56xx10^(-3)Wm^(-2)`

D

`1.256xx10^(-3)Wm^(-2)`

Text Solution

Verified by Experts

The correct Answer is:
A
`I=(P)/(4pir^(2))`
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