In a sample of excited hydrogen atoms electrons make transition from `n=2` to `n=1.` Emitted quanta strikes on a metal of work function 4.2eV. Calculate the wavelength(in A) associated with ejected electrons having maximum kinetic energy.

If Photon having wavelength 6.2nm was allowed to strike a metal plate having work function 50eV then calculate wavelength associated with emitted electron :

In a hydrogen atom , the electron atom makes a transition from n = 2 to n = 1 . The magnetic field produced by the circulating electron at the nucleus

Light of wavelength 500 nm is incident on a metal with work function 2.28 eV . The de Broglie wavelength of the emitted electron is

Light of wavelength 500 nm is incident on a metal with work function 2.28 eV . The de Broglie wavelength of the emitted electron is

If an electron having kinetic energy 2 eV is accelerated through the potential difference of 2 volt. Then calculate the wavelength associated with the electron

Calculate the wavelength of a photon emitted when an electron in H- atom maker a transition from n=2 to n=1

The energy of separation of an electron in a hydrogen like atom in excited state is 3.4eV. The de-Broglie wave length (in Å) associated with the electron is :

The ground state energy of an atom is -13.6eV . The photon emitted during the transition of electron from n=3 to n=1 state, is incidenet on a photosensitive material of unknown work function. The photoelectrons are emitted from the materials with a maximum kinetic energy of 9 eV. the threshold wavelength of the material used is

The electron in a hydrogen atom at rest makes a transition from n = 2 energy state to the n = 1 ground state. find the energy (eV) of the emitted photon.

Electrons from n = 2 to n= 1 in hydrogen atom is made to fall on a metal surface with work function 1.2ev. The maximum velocity of photo electrons emitted is nearly equal to