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?

A The wavelength of X-ray photon is less than the wavelength of visible radiation photon.
B Both\ \ the\ \ photons\ \ have\ \ different energies.
C The\ speeds\ of\ both\ the\ photons\ in vacuum are different
D The\ \frequency\ \of\ \X-ray\ \photon\ \is higher\ than\ the\ frequency\ of\ visible radiation photon.

Correct Answer: The\ speeds\ of\ both\ the\ photons\ in vacuum are different

The speed of all the electromagnetic radiation are always   same   and   equal   to   the numerical value 3 x 10^8m/sec.

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