Exercise

What is the numerical value of plank constant?

A particle of mass ${10}^{-31} \mathrm{kg}$ is moving with the velocity of ${10}^5\mathrm{m}/\mathrm{s}$. The wavelength of the particle is:

When the photoelectric emission is taking place, increasing the intensity of light will,

Light of wavelength $\lambda$ and intensity $I$ is incident on a metallic surface and electrons are emitted. Which of the following change will, by itself, result in a greater number of electrons being emitted?

The work function for a metal surface is $4.14 \mathrm{eV}$. The threshold wavelength for this metal surface is

In an experiment on the photoelectric effect, the following graphs were obtained between the photoelectric current (I) and the anode potential (V). Name the characteristic of the incident radiation that was kept constant in this experiment.

The relativistic expression for the wavelength of electrons moving with very high speed is

What will be the energy of each photon in monochromatic light of frequency $5\times {10}^{14} \mathrm{Hz}$?