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What physical quantity is the same for X-rays of wavelength 10 ^ 10 m, red light of wavelength 6800 Å and radiowaves of wavelength 500m

3. What physical quantity is the same for X-rays of wavelength 10 ^{-10} m, red light of wavelength 6800 \dot{A} and radiowaves of wavelength 500m?

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The speed with which these electromagnetic waves travel in a vacuum will be the same and will be equal to 3\times 10^{8}ms^{-1} (speed of light in vacuum).

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