Photoelectric Effect Questions

A pulse of light of duration 100 ns is absorbed completely by a small object initially at rest. Power of the pulse is 30 mW and the speed of light is 3 × 108 ms-1. The final momentum of the objec...

For photoelectric emission from certain metal the cutoff frequency is ν. If radiation of frequency 2ν impinges on the metal plate, the maximum possible velocity of the emitted electron will ...

The radiation corresponding to 3 → 2 transition of hydrogen atoms falls on a metal surface to produce photoelectrons. These electrons are made to enter a magnetic field of 3 × 10-4 T. If th...

When the energy of the incident radiation is increased by 20%, the kinetic energy of the photoelectrons emitted from a metal surface increased from 0.5 eV to 0.8 eV. The work function of the metal is...

If the kinetic energy of the particle is increased to 16 times its previous value, the percentage change in the de-Broglie wavelength of the particle is

Hydrogen atom in ground state is excited by a monochromatic radiation of λ = 975. Number ofspectral lines in the resulting spectrum emitted will be...

The binding energy per nucleon of and nuclei are 5.60 MeV and 7.06 MeV, respectively. In the nuclear reaction Li + H → He + He + Q, the value of energy Q released is...

A point source causes photoelectric effect from a small metal plate. Which of the following curves may represent the saturation photocurrent as a function of the distance between the source and the me...

In a fission reaction 23692U 117X + 117Y + n + nthe average binding energy per nucleon of X and Y is 8.5 MeV whereas that of 236U is 7.6 MeV. The total energy liberated will be about :...

When a β−-particle is emitted from a nucleus, the neutron-proton ratio :

The anode voltage of photocell is kept fixed. The wavelength λ of the light falling on the cathode is gradually changed. The plate current I of the photocell varies as follows :...

Photoelectric effect experiments are performed using three different metal plates p, q and r having work functions φp = 2.0 eV, φq = 2.5 eV and φr = 3.0 eV, respectively. A light beam c...

Two radiations of photons energies 1 eV and 25 eV, successively illuminate a photosensitive metallicsurface of work function 0.5 eV. The ratio of the maximum speeds of the emitted electrons is...

A 200 W sodium street lamp emits yellow light of wavelength 0.6 μm. Assuming it to be 25% efficientin converting electrical energy to light, the number of photons of yellow light it emits per sec...

Monochromatic radiation emitted when electron on hydrogen atom jumps from first excited to theground state irradiates a photosensitive material. The stopping potential is measured to be 3.57 V. Thethr...

The thershold frequency for a photosensitive metal is 3.3 × 1014 . If light of frequency 8.2 × 1014 Hz is incident on this metal, the cut-off voltage for the photoelectron emission is nearly...

The decreasing order of wavelength of infrared, microwave, ultraviolet and gamma raysis

Photoelectric emission occurs only when the incident light has more than a certain minimum

In the Davisson and Germer experiment, the velocity of electrons emitted from the electron gun can be increased by

Light of two different frequencies whose photons have energies 1 eV and 2.5 eV respectively illuminate a metallic surface whose work function is 0.5 eV successively. Ratio of maximum speed of emitted ...