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What is the frequency of a radio wave of wavelength 150m if ...

What is the frequency of a radio wave of wavelength 150m if the velocity of radio waves in free space is 3 x 108ms1?

A.

4.5 x 1010Hz

B.

5 x 109Hz

C.

4.5 x 108Hz

D.

2 x 107Hz

E.

2 x 106Hz

Correct answer is E

V=fλ,f=vλ=3×1081502×106Hz