The velocity of all radio waves in free space is \( 3 \times 10^{8} \mathrm{~m} / \mathrm{s} \).....

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The velocity of all radio waves in free space is \( 3 \times 10^{8} \mathrm{~m} / \mathrm{s} \). The frequency of a radio waves of
P
wavelength \( 150 \mathrm{~m} \) is
W
(1) \( 20 \mathrm{kHz} \)
(2) \( 2 \mathrm{kHz} \)
(3) \( 2 \mathrm{MHz} \)
(4) \( 1 \mathrm{MHz} \)


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