1 Ev.....(J)

The photoelectric threshold wavelength for Potassium having work function of 2eV is.......... (Take h= 6.6 xx 10^(-34) J s. 1 eV = 1.6 xx 10^(-19) J , C = 3 xx 10^8 Ms^(-1) )

The frequency of a Photon having energy 100 eV is ...... Hz. (take h = 6.62 xx 10^(-34) Js, 1eV = 1.6 xx 10^(-19) J)

A photon of wavelength 4 xx 10 ^(-7) m strickes on metal surface, the work function of the metal being 2.13 eV. Calculate the velocity of the photoelectron (1 eV = 1. 6020 xx 10 ^(-19) J)

The energy of an excited hydrogen atom is -0.85 eV . Find the angular momentum of the electron. (h = 6.63 xx 10^(-34) J.s., pi = 3.142, E_(1) = -13.6 eV)

Calculate wavelength of a photon having energy 1.2 ev. (1 ev = 1.601 xx 10^(-19) Joule)

What will be the angular momentum of an electron, if energy of this electron in H -atom is 1.5 eV (in J-s )?

Electorn volt is the unit of energy ( 1 eV =1.6xx10^(-19)J) in H-atom the binding energy of electron in first orbit is 13.6eV . The same in joule (J) is

The de-Broglie wavelength of an electron having 80 eV of energy is nearly ( 1 eV = 1.6 xx 10 J-sec Plank's constant = 6.6 xx 10 J-sec )

Calculate the wavelength and energy of radiation for the elctronic transition form infinity to ground state for one H-atom . Given e_1 =- 13. 6 eV ( 1 1 eV = 1,. 6 xx 10^(-19) J) .