Physics
Isotopes of an element contain

the same number of neutrons but different number of protons
equal number of protons and electrons
equal number of nucleons
the same number of protons but different number of neutrons

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