A photocell with a work function of 2.5 eV is illuminated by light of wavelength 400 nm. What is the maximum speed of the emitted photoelectrons? (Planck's constant $h = 6.63 imes 10^{-34}$ Js, speed of light $c = 3 imes 10^8$ m/s, mass of electron $m_e = 9.11 imes 10^{-31}$ kg)

Vidicon works on the principle of

Given that a photon of light of wavelength 10,000 $\mathop A\limits^ \circ$ has an energy equal to 1.23 eV. When light of wavelength 5000 $\mathop A\limits^ \circ$ and intensity ${I_0}$ falls on a photoelectric cell, the surface current is $0.40 imes {10^{ - 6}}$ A and the stopping potential is 1.36 V, then the work function is

An $\alpha$-particle of mass $6.4 imes {10^{ - 27}}$kg and charge $3.2 imes {10^{ - 19}}$ C is situated in a uniform electric field of $1.6 imes {10^5}\;{\rm{V}}{{\rm{m}}^{ - 1}}.$ The velocity of the particle at the end of $2 imes {10^{ - 2}}$ m path when it starts from rest is

Photo cell is a device to

Vidicon works on the principle of

When an inert gas is filled in place of vacuum in a photo cell, then

The ratio of the de Broglie wavelengths of an electron of energy $10\;eV$ to that of person of mass $66\;kg$ travelling at a speed of $100\;km/hr$ is of the order of

Which metal is commonly used as the cathode in a photocell due to its low work function?

Relation between the stopping potential ${V_0}$ of a metal and the maximum velocity v of the photoelectron is

Photons emitted in transition of electrons from n = 2 to n = 1 in hydrogen atom is made to fall on a metal surface with work function 1.2 eV. The maximum velocity of photoelectron emitted is nearly equal to