The time taken by a photoelectron to come out after the photon strikes is approximately

The time taken by a photoelectron to come out after photon strikes is approximately

The pH of tears coming out of a person's eye is approximately

The time taken for 90% of 1st order reaction to complete is approximately

The time taken for 90% of a first order reaction to be completed is approximately

The ratio of number of photoelectrons ejected to the number of the photons falling on a metal surface is..........than.......... .

Ground state energy of H-atom is (-E_(1)) ,t he velocity of photoelectrons emitted when photon of energy E_(2) strikes stationary Li^(2+) ion in ground state will be:

Ground state energy of H-atom is (-E_(1)) ,t he velocity of photoelectrons emitted when photon of energy E_(2) strikes stationary Li^(2+) ion in ground state will be:

Ground state energy of H-atom is (E_(1)) ,t he velocity of photoelectrons emitted when photon of energy E_(2) strikes stationary Li^(2+) ion in ground state will be: