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Q.

The magnetic field  in a plane electromagnetic wave is given by By=2×10−7sin(0.5×103x+1.5×1011t) . This electromagnetic wave is

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a

a visible  light

b

an infrared wave

c

a micro  wave

d

a radio wave

answer is C.

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Detailed Solution

Here  By=2×10−7sin(0.5×103x+1.5×1011t)Comparing it with,  By=Bosin(kx+wt)We have w=1.5×1011 rad/s & frequency ν=w2π= 1.5×10112×3.14=2.39×1010HzRange of microwave is  109Hz to 1012Hz
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