What physical quantity is the same for \( X \)-rays of wavelength \( 10^{-10} \mathrm{~m} \), th...

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What physical quantity is the same for \( X \)-rays of wavelength \( 10^{-10} \mathrm{~m} \), the red light of wavelength \( 6800 \AA \) and radio waves of wavelength \( 500 \mathrm{~m} \) ?
(A) Amplitude
(B) Equipotential Surface
(C) Speed of light
(D) Magnetic field
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