When the electromagnetic radiation of wavelength 300 nm falls on the surface of sodium electrons are emitted with a kinetic energy of `1.68x10^5J mol^-1`
What is the minimum energy needed to remove an electron from sodium?

Electromagnetic radiatio of wavelength 242 nm is just sufficient to ionise the sodium atom. Calculate the ionisation energy of sodium in kJ*mol^(-1) .

When ultraviolet rays of wavelength 620 Å is incident on a hydrogen atom in the ground state, its electron is emitted with a velocity of 1.5 xx10^(6) m *s^(-1) . What is the ionisation energy of hydrogen ? Given , h= 6.625xx10^(-34)J *s , mass of electron = 9.1 xx 10^(-31)kg, c=3xx 10^(8)m*s^(-1) and 1 eV=1.6xx 10^(-19)J .

If the intensity of incident radiation on a metal surface is doubled, what happens to the kinetic energy of the electrons emitted?

Calculate the kinetic energy of an electron having potential energy 1.5 ev. in SI unit.

The wavelength of each of a photon and an electron is 1.00 nm. Find their (a) momentum and (b) energy.

The radiation , emitted due to transition of hydrogen atom from the second excited state to ground state, is incident of the surface of sodium metal. The maximum kinetic energy of the emitted photoelectrons is 10.27 eV. What is the work function of sodium? Given, ionisation energy of hydrogen =13.59 eV.

The kinetic energy of an electron is 4.55x10^(-25)J calculate the wavelength.

The de Broglie wavelength of an electron is the same as that of a 50 keV X-ray photon. The ratio of the energy of the photon to the kinetic energy of the electron is the energy equivalent of electron mass is 0.5 MeV)