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The magnetic field in a plane electromag...

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

A

a visible light.

B

an infrared wave.

C

a microwave.

D

a radio wave.

Text Solution

Verified by Experts

The correct Answer is:
C
Here `omega=1.5xx10^(11)s^(-1)`, hence frequency `v=(omega)/(2pi)=(1.5xx10^(11))/(2xx3.14)=2.4xx10^(10)Hz`. Obvioulsy, the e.m. wave is a microwave.
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