The value of Planck's constant is

The value of Planck's constant in SI unit is

The value of Planck's constant in SI unit is

What is the value of Planck's constant

Ultraviolet light of wavelength 800 A and 700 A when allowed to fall on hydrogen atoms in their ground states is found to liberate electrons with kinetic energies 1.8eV and 4.0eV , respectively. Find the value of Planck's constant.

Ultraviolet light of wavelength 800 A and 700 A when allowed to fall on hydrogen atoms in their ground states is found to liberate electrons with kinetic energies 1.8eV and 4.0eV , respectively. Find the value of Planck's constant.

In an experiment on photoelectric effect, the slope of the cut off voltage versus frequency of incident light is found to be 4.12xx10^(-15)Vs . Given e=1.6xx10^(-19)C , estimate the value of Planck's constant.

a. A stopping potential of 0.82V is required to stop the emission of photoelectrons from the surface of a metal by light of eavelength 4000 A . For light of wavelength 3000 A , the stopping potential is 1.85V . Find the value of Planck's constant. [1 electrons volt (eV) =1.6xx10^(-19)J] b. At stopping potential, if the wavelength of the incident light is kept fixed at 4000 A , but the intensity of light increases two times, will photoelectric current be botained ? Give reasons for your answer.

A mercury lamp is a convenient source for studying frequency dependence of photoelectric emission, since it gives a number of spectral lines ranging from the UV to the end of the red visible spectrum. In our experiment with rubidium photocell, the following lines from a mercury source were used: lambda_(1)=3650A^(@), lambda_(2)=4047A^(@), lambda_(3)=4358A^(@), lambda_(4)=5461A^(@), lambda_(5)=6907A^(@) The stopping voltages, respectively were measured to be: V_(01)=1.28V, V_(02)=0.95V, V_(03)=0.74V, V_(04)=0.16V, V_(05)=0V . (a) Determine the value of Planck's constant h. (b) Estimate the threshold frequency and work function for the material.

Plot a labelled graph of maximum kinetic energy of photo electrons versus frequency of incident radiation. State how you will obtain the value of Planck.s constant h from the graph.

(i) Plot a labelled graph of |V_(s)| where V_(s) is stopping potential versus frequency f of the incident radiation. (ii) State how will you use this graph to determine the value of Planck.s constant.