Show that the speed of electron in the innermost orbit of H-atom is `1/137` times the speed of light vacuum.

The energy of an electron in nth orbit of hydrogen atom is

Determine the speed of the electron in the n=3 orbit of hydrogen atom.

Using bohr's second postaulate of quantisation of orbital angular momentum,show that the circumfernece of the electron in the nth orbital srtate in hydrogen atom is n times the de-Broglie wavelength associated with it.

The speed of electromagnetic waves in vacuum is equal to

The refractive index of water is 1.33.What will be the speed of light in water?

Explain how Corpuscular theory predicts the speed of light in a medium, say, water, to be greater than the speed of light in vacuum. Is the prediction confirmed by experimental determination of the speed of light in water ? If not, which alternative picture of light is consistent with experiment?