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

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Physics
Why does the sea appear blue in colour?

Refraction of the sun light
Scattering of the sunlight by water molecules
Interference of the sun light from water surface
Reflection of the sun light from water surface

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