Calculate the frequency of a photon,whose energy is 7.5 eV.Given,`1 eV = 1.6 xx 10^(-19) J` and `h = 6.62 xx 10^(-34) J s`.

calculate the frequency of a photon of energy 3 eV. Givem h=6.62 xx10^(-34) Js.

A semiconductor has accpetor level 1.57 eV above the valence band.What is the maximum wavelength of light required to create a hole?Given that 1 eV=1.6 xx 10^(-19)J and h=6.62 xx 10^(-34) Js .

Calculate the frequency associated with a photon of energy 3.3 xx 10^(-20) J (h=6.6 xx 10^(-34) Js) .

Find the wavelength for a beam of neutrons,whose kinetic energy is 100 eV.Given that mass of neutron = 1.676 xx 10^(-24) g and h= 6.62 xx 10^(-27) erg s. .

The energy liberated in the combination of a hole-electron pair is converted into electromagnetic radiation.What is tha band gap,if the maximum wawveelngth fo th radiation emitted is 820 nm?Gien that 1 eV=1.6 xx 10^(-19) J and h=6.62 xx 10^(-34) Js .