An electromagnetic wave of wavelength $\lambda$ is incident on a photosensitive surface with negligible work function. If the emitted photoelectron has mass $m$ and a de-Broglie wavelength $\lambda_d$, then what is the relationship between $\lambda$ and $\lambda_d$?

The stopping potential for photoelectrons emitted from a metal surface illuminated by light of wavelength $\lambda$ is $V_0$. If the wavelength is reduced to $\lambda/2$, keeping the intensity constant, the new stopping potential will be:

Energy from the sun is received on earth at the rate of 2 cal per ${\rm{c}}{{\rm{m}}^2}$ per min. if average wavelength of solar light be taken at 5500 A then how many photons are received on the earth per ${\rm{c}}{{\rm{m}}^2}$ per min?

(Take $h = 6.6 imes {10^{ - 34}}$Js, 1cal=4.2 J).

The maximum wavelength of radiation that can produce photoelectric effect in certain metal is 200 nm. The maximum kinetic energy acquired by electron due to radiation of wavelength 100 nm will be

An electron of charge $'e'$ coulomb passes through a potential difference of $V\;volts.$ Its energy in $'joules'$ will be

Einstein’s photoelectric equation states that $Ek = hv - \phi .$ In this equation ${E_k}$ refers to

A light whose frequency is equal to $6 imes {10^{14}}{\rm{Hz}}$ is incident on a metal whose work function is 2eV. $\left[ {h = 6.63 imes {{10}^{ - 34}}\;Js,\;1eV = 1.6 imes {{10}^{ - 19}}\;J} \right].$ The maximum energy of the electrons emitted will be

When light falls on a metal surface, the maximum kinetic energy of the emitted photo-electrons depends upon

When the light of frequency $2{v_ \circ }$ (where ${v_ \circ }$ is threshold frequency), if incident on a metal plate, the maximumvelocity of electrons emitted is ${{\rm{v}}_{\rm{1}}}$. When the frequency of the incident radiation of increased to $5{v_ \circ }$, the maximumvelocity of electrons emitted from the same plate is ${{\rm{v}}_{\rm{2}}}$ : The ratio of ${{\rm{v}}_{\rm{1}}}$ to ${{\rm{v}}_{\rm{2}}}$ is

An electron is accelerated through a potential difference of $V$ volt. The speed of electrons will be

The threshold wavelength for photoelectric emission from a material is $4800\;\mathop A\limits^ \circ$. Photoelectrons will be emitted from the material, when it is illuminated with light from a