Physics
The sky appears blue because

In white light, the blue component dominates
All colours interfere to produce blue
The atmosphere scatters blue colour more than the others
It is actually blue

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Physics
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?

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

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