Light coming from a discharge tube filled with hydrogen falls on the cathode fo t he photoelectric cell. The work function of the surface of cathode is `4eV`. Which one of the following values of the anode voltage (in volts) with respect to the cathode will likely to make the photo current zero?

Light coming from a discharge tube filled with hydrogen falls on the cathode of the photoelectric cell. The work function of the surface of cathode is 4eV Which one of the following values of the anode voltage (in volts ) with respect to the cathode willl likely to make the photoo current zero.

Light from a hydrogen tube is incident on the cathode of a photoelectric cell the work function of the cathode surface is 4.2 eV . In order to reduce the photo - current to zero the voltage of the anode relative to the cathode must be made

Radiation from a hydrogen discharge discharge tube is incident on the cathode ofa photocell having energy 3.4 eV .The work function of the cathode suface is 3.2 eV. To reduce the photocurrent to zero, the voltage (in volts) of th anode realtive to the cathode must be made

Light from a discharge tube containing hydrogen atoms falls on the surface of a piece of sodium . The kinetic energyof the fastest photonelectrons emittede from from sodium is 0.73 eV . The work function for sodium is 1.82 eCV find (a) the energy of the photons causing the photoelectric emission , (b) the quantum number of the two level inveloved in the emission of there photons, (c ) the change in the angular momentum of the electron in the hydrogen atom in the above transition and, (d)the recoll speed of emitted atom assuming it to be at rest before the transition. (lonization potential of hydrogen is 13.6 eV )

Work function of a cathode is 4.2 eV. Energy of incident photons is 6.2 eV . Anode is kept at + 2 volt w.r.t cathode. Calculate minimum and maximum K.E. of electrons reaching at the anode.

de Broglie proposed dual nature for electron by putting his famous equation lambda = (h)/(mv). Later on, Heisenberg proposed uncertainty principle as deltapDeltax ge (h)/(4pi). On the contrary, Particle nature of electron was established on the basis of photoelectric effect. When a photon strikes the metal surface it gives up its energy to the electron. Part of this energy (say W) is used by the electrons to escape from the metal and the remaining energy imparts kinetic energy (1//2 mv^(2)) to the ejected photoelectron. The potential applied on the surface to reduce the velocity of photoelectron to zero is known as stopping potential . When a beam of photons of a particular energy was incident on a surface of a particular pure metal having work function =(40 eV), some emitted photoelectrons had stopping potential equal to 22 V. some had 12V and rest had lower values. Calculate the wavelength of incident photons assuming that at least one photoelectron is ejected with maximum possible kinetic energy :

The graph between photo electric current and cathode potential when the anode is kept at zero potential, for light of two different intensities out of the same frequency looks like the one: