Dual Nature of Matter and Radiation MCQs for NEET — Physics Questions with Answers

Light of wavelength $\mathrm{\lambda }$ strikes a photo-sensitive surface and electrons are ejected with kinetic energy E. If the kinetic energy is to be increased to 2E, the wavelength must be changed to $\mathrm{\lambda }\text{'}$ where 

If in a photoelectric experiment, the wavelength of incident radiation is reduced from 6000 Å to 4000 Å then

The photoelectric work function for a metal surface is 4.125 eV. The cut-off wavelength for this surface is

As the intensity of incident light increases

Which of the following is dependent on the intensity of incident radiation in a photoelectric experiment

The work function of a substance is 4.0 eV. The longest wavelength of light that can cause photoelectron emission from this substance is approximately

The maximum kinetic energy of photoelectrons emitted from a surface when photons of energy 6 eV fall on it is 4 eV. The stopping potential in volts is

Work function of a metal is 2.1 eV. Which of the waves of the following wavelengths will be able to emit photoelectrons from its surface ?

The cathode of a photoelectric cell is changed such that the work function changes from ${\mathrm{W}}_1$ to ${\mathrm{W}}_2$ $\left({\mathrm{W}}_2>{\mathrm{W}}_1\right)$. If the current before and after the change are ${\mathrm{I}}_1$ and ${\mathrm{I}}_2$, all other conditions remaining unchanged, then (assuming $\mathrm{h\nu }>{\mathrm{W}}_2$) :

A beam of light of wavelength $\mathrm{\lambda }$ and with illumination L falls on a clean surface of sodium. If N photoelectrons are emitted each with kinetic energy E, then