a. Give the expression showing the relation between energy and momentum of a photon.
b. "de-Broglie wavelength supports Bohr's model of stationary orbits." Comment on this statement.
c. Is there any difference between the wavelength of the radiation and d-Broglie wavelength of a photon of that radiation? Explain.

Explanation

a. Momentum of photon `=(hupsilon)/(c )`
b. Bohr orbit condition, `mvr=(nh)/(2pi)`
i.e., `pr=(nh)/(2pi)`
taking `(h)/(p)=(2pi r)/(n)=(L)/(n)`. This suggests that `lambda=(L)/(n)` or total length of the orbit is n times de Broglie.s wavelength.
c. No. Wavelength of radiation `lambda=(c )/(upsilon)`
de Broglie.s wavelength `lambda=(h)/(p)=(c )/(upsilon)`