A plane electromagnetic wave travels in vacuum along z-direction. If the frequency of the wave is 40 MHz then its wavelength is
A plane electromagnetic wave travels in vacuum along z-direction. If the frequency of the wave is 40 MHz then its wavelength is
A. 5 m
B. 7.5 m
C. 8.5 m
D. 10 m
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Correct Answer - B
Wavelength, `lambda=(c)/(upsilon)=(3xx10^(8)"m s"^(-1))/(40xx10^(6)s^(-1))=7.5m`
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