When monochromatic radiation of intensity $I$ falls on a metal surface, the number of photoelectron and their maximum kinetic energy are $N$ and $T$ respectively. If the intensity of radiation is $2I,$ the number of emitted electrons and their maximum kinetic energy are respectively

Photoelectric effect can be explained by

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

When yellow light is incident on a surface, no electrons are emitted while green light can emit. If red light is incident on the surface, then

A parallel beam of light is incident normally on a plane surface absorbing 40% of the light and reflecting the rest. If the incident beam carries 60 W of power, the force exerted by it on the surface is

A tiny spherical oil drop carrying a net charge $q$ is balanced in still air with vertical uniform electric field of strength $\frac{{81\pi }}{7} imes {10^5}{\rm{V}}{{\rm{m}}^{ - 1}}.$When the field is switched off, the drop is observed to fall with terminal velocity $2 imes {10^{ - 3}}{\rm{m}}{{\rm{s}}^{ - 1}}.$ Given ${\rm{g}} = 9.8{\rm{\;m}}{{\rm{s}}^{ - 2}},$ viscosity of the air =$1.8 imes {10^{ - 5}}{\rm{Ns\;}}{{\rm{m}}^{ - 2}}{\rm{\;and\;the\;density\;of\;oil}} = 900\;{\rm{kg}}\;{{\rm{m}}^{ - 3}},$ the magnitude of $q$ is

The {K_α}\;X-ray emission line of tungsten occurs at $\lambda = 0.021nm.$ The energy difference between $K$ and $L$ levels in this atom is about

If a source of monochromatic light with a wavelength of 550 nm emits $2.2 imes 10^{-3}$ W of power, what is the approximate number of photons emitted per second? (Consider $h = 6.6 imes 10^{-34}$ Js)

The energy of a photon of light with wavelength $5000\;\mathop A\limits^ \circ$ is approximately $2.5\;eV.$ This way the energy of an $X$-ray photon with wavelength $1\mathop A\limits^ \circ$would be

Two different metals M1 and M2 have work functions $\phi_1$ and $\phi_2$ respectively, where $\phi_1 > \phi_2$. If both metals are illuminated with light of the same frequency $

u$, such that$h

u > \phi_1$, which metal will exhibit a larger stopping potential?

The frequency and intensity of a light source are doubled. Consider the following statements

I. Saturation photocurrent remains almost the same.

II. Maximum kinetic energy of the photoelectrons is doubled.