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A photon of X-ray has energy of 1 keV A photon...

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Physics
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A photon of X-ray has energy of 1 keV. A photon of visible radiation has energy of 3 eV. In this context, which one of the following statements is not correct?

Answer & Solution
Correct Answer: Option C
The speed of all the electromagnetic radiation are always same and equal to the numerical value 3 x 108 m/sec.
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