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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 of electromagnetic waves in vacuum is fixed and is equal to `3xx10^8 m.s^(-1)` . Since all the three waves (viz. X - ray, red light and radio waves) are electromagnetic in nature, their speed in vacuum remains same.
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