De Broglie's Explanation of Bohr's Second Postulate of Quantisation

Use Bohr's postulate for permitted orbits to prove that the circumstances of the nth permitted orbit for the electron can contain exactly n wavelengths of the de Broglie wavelength associated with the electron in that orbit.

Write two limitations of Bohr's atomic model.

Write a short note on Debroglie's explanation of Bohr's second postulate of quantization.

Find out the wavelength of the electron orbiting in the ground state of hydrogen atom. 

The radius of the $4^{\mathrm{t}\mathrm{h}}$ Bohr orbit is $0.864\mathrm{ }\mathrm{n}\mathrm{m}$. The de Broglie wavelength of the electron in that orbit is:

An electron is moving in Bohr's fourth orbit. Its de-Broglie wavelength is $\lambda$. What is the circumference of the fourth orbit?

For which of the following particles will it be most difficult to experimentally verify the de-Broglie relationship?

The de Broglie wavelength of an electron in the first Bohr orbit of hydrogen atom is

The wavelength of light from the spectral emission line of sodium is 589 nm. The kinetic energy at which a neutron would have the same de Broglie wavelength is

The circumference of the second orbit of an atom or ion having single electron, is $4\times {10}^{-9} \mathrm{m}$. The de Broglie wavelength of electron revolving in this orbit should be: