If the velocity of light in free space is \( 3 \times 10^{8} \mathrm{~m} / \mathrm{sec} \) then ...

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If the velocity of light in free space is \( 3 \times 10^{8} \mathrm{~m} / \mathrm{sec} \) then the value of wavelength of electromagnetic wave of frequency \( 2 \times 10^{6} \mathrm{~Hz} \) is \( 25 \mathrm{xm} \). Find the value of \( x \).
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