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

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Physics
What is the principle of a ''Life Jacket"?

It provides oxygen to a drowning person
It increases the volume of the person to keep him afloat
It decreases the volume of the person to keep him afloat
The person can sit on it like a raft

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