Einstein explained photoelectric effect on the basis of Planck's quantum theory, where light travels in the form of small bundles of energy called…

Einstein explained photoelectric effect on the basis of Planck's quantum theory, where light travels in the form of small bundles of energy called photons. The energy of each photon is $\displaystyle \mathrm{h} v$, where $\displaystyle v$ is the frequency of incident light and $\displaystyle \mathrm{h}$ is Planck's constant. The number of photons in a beam of light determines the intensity of the incident light. A photon incident on a metal surface transfers its total energy $\displaystyle \mathrm{h} \nu$ to a free electron in the metal. A part of this energy is used in ejecting the electron from the metal and is called its work function. The rest of the energy is carried by the ejected electron as its kinetic energy.

Which of the following graphs can be used to obtain the value of Planck's constant?

Photocurrent versus Intensity of incident light

Photocurrent versus Frequency of incident light

Cut-off potential versus Frequency of incident light

Cut-off potential versus Intensity of incident light

When the frequency of the incident light is increased without changing its intensity, the saturation current :

increases linearly

decreases

increases non-linearly

remains the same

Which of the following graphs shows the variation of photoelectric current I with the intensity of light?

DANCH