The ionisation enthalpy of hyrdogen is `1312.0 KJ mol^-1`. Express the value in eV per atom using the relation 1 eV = `1.602 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)

If the ionization energy of He^(+) is 19.6xx10^(-18) J per atom then the energy of Be^(3+) ion in the second stationary state is :

The enrgy gap of silicon is 1.14 eV.Find the maximum wavelength ,at which silicon starts energy absorption.Give that 1 eV=1.6 10^(-19) J and h=6.62 xx 10^(-34) J s .

The electron moves around the ucelus in a hydrogen atom of radis 0.51overset(@)A , with a speed of 2xx10^5ms^-1 . Calculate the following: The magnetic moent associated with the electron take e = 1.6 xx 10^-19 C and mu_0 = 4 pi xx 10^-7 SI units.

Energy of an electron in the ground state of the hydrogen atom is -2.18xx10^(-18)J . Calculate the ionization enthalpy of atomic hydrogen in terms of J mol^(-1) .

An electron and a proton are detected in a cosmic ray experiment, the first with kinetic energy 10 keV, and the second with 100 keV. Which is faster, the electron or the proton ? Obtain the ratio of their speeds, (electron mass = 9.11xx10^-31 kg , proton mass = 1.67xxl0^-27kg , 1 eV = 1.60 xx 10^-19 J )

A proton enters a magnetic field of 4 T intensity with a velocity of 2.5 xx 10^6 ms^-1 at an angle of 30^@ with the field. Find the magnitude of the force on the proton. Charge of the proton = 1.602 xx 10^-19 coulomb.