Calculate the wavelength of radio of frequency $10^{9} H z$ . The speed of radio waves is $3 \times 10^{8} m / s$

60 c m

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40 c m

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30 c m

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10 c m

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Solution

The correct option is C $30 c m$
$λ = \frac{c}{f} = \frac{3 \times 10^{8} m / s}{10^{9}} = 3 \times 10^{- 1} = 30 c m$
$λ = 30 c m$

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