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Which physical quantity is the same for ...

Which physical quantity is the same for X-rays of wavelength `10^(-10)` m, red light of wavelength 6800 Å and radio waves of wavelength 500 m?

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The speed in vacuum is same for all of them as they are electronetic waves . The speed of electromagnetic waves . The speed of electromagnetic waves in vacuum is
` c= 3xx 10^(8) ms ^(-1)`
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