Calculate the wavelength of a photon of energy `10^(10)` eV (electron volt(. Given Planck.s constant `h=6.625 xx 10^(-34) Js` (Joule Second).

Calculate the de-Broglie waveelngth of an electron of energy 400 eV.Given,lanck's constant = 6.6 xx 10^(-34) J s, mass of electron = 9.1 xx 10^(31) kg,1 eV = 1.6 xx 10^(-19) J .

Light of frequency 7.21 x 10^(14)Hz (Hertz) is incident on a metal surface. Electrons with a maximum speed if 6.0 xx 10^5ms^(-1) (metre per second) are ejected from the surface. What is the threshold frequency fro photo emission of electrons? Given rarr h(Planck constant) = 6.63 xx 10^(-34) Js (Joule Second) m_e (mass of electron)= 9.1 xx 10^(-31) kg (kilogram)

Calculate the frequency and wavelength of photon with energy 5 ( 10*-8)J.

Calculate momentum of electron, if their wavelength is 2 overset @ A . Given, Planck's constant h=6.625 xx 10^(-34) Js , mass of electron m=9.1 xx 10^(-31) kg.

Calculate momentum of electron, if their wavelength is 1overset @ A . Given, Planck's constant h=6.625 xx 10^(-34) Js , mass of electron m=9.1 xx 10^(-31) kg.