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1.
According to Maxwell's hypothesis, a changing electric field gives rise to
2.
The shortest wavelength of X-rays emitted from an X-rays tube depends upon
3.
Hydrogen atom does not emit X-rays because
4.
The refractive index and the permeability of a medium are respectively
. The relative permittivity of the medium is nearly
. The relative permittivity of the medium is nearly
5.
The energy of X-ray photon is 2200 eV. Its frequency would be