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The magnetic field in a plane e.m. wave ...

The magnetic field in a plane e.m. wave is given by
`B_y=2xx10^-7sin(0.5xx10^3x+1.5xx10^(11)t)`.
This e.m. wave is

A

a visible light

B

an infrared wave

C

a microwave

D

a radiowave

Text Solution

Verified by Experts

The correct Answer is:
c
Here, `B_y=2xx10^-7sin(0.5xx10^3x+1.5xx10^(11)t)`
comparing it with, `B_y=B_0sin(kx-omegat)`, we have
`omega=1.5xx10^(11)`,
`v=omega/(2pi)=(1.5xx10^(11))/(2xx3.14)=2.39xx10^(10)Hz.`
Range of microwave is `10^9Hz` to `10^(12)Hz`.
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