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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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Knowledge Check

  • The magnetic field in a plane electromagnetic wave is given by B_(y) = 2 xx 10^(-7) sin (0.5 xx 10^(3)x + 1.5 xx 10^(11) t) . This electromagnetic wave is

    A
    a visible light
    B
    an infrared wave
    C
    a microwave
    D
    a radio wave

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    C
    `E_(y)=30sqrt(2) sin (0.5xx10^(11)x+0.5xx10^(3)t) V//m`
    D
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