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

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Physics
A metal ball and a rubber ball, both having the same mass, strike a wall normally with the same velocity. The rubber ball rebounds and the metal ball does not rebound. It can be concluded that

The rubber ball suffers greater change in momentum
The metal ball suffers greater change in momentum
Both suffer the same change in momentum
The initial momentum of the rubber ball is greater than that of the metal ball

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