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Question

What physical quantity is the same for X-rays of wavelength10–10 m, red light of wavelength 6800 Å and radiowaves of wavelength 500m?

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Solution

It is given that the wavelength of X-rays is 10 10 m and the wavelength of the red light is 6800 A and the wavelength of radio waves is 500m.

The speed of the light in vacuum will be the same for all wavelengths and it will be independent of the wavelength in the vacuum.

The value of speed of light is 3× 10 8 m/s.

Hence, we can say that the speed of light is the physical quantity which is same for all wavelengths in a vacuum.


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