NEET Questions

Photoelectric effect is maximum in

The electron in the hydrogen atom jumps from excited state $\left( {n = 3} \right)$ to its ground state $\left( {n = 1} \right)$ and the photons thus emitted irradiate a photosensitive material. If the work function of the material is $5.1\,\,{\rm{eV}}$, the stopping potential is estimated to be (the energy of the electron in ${n^{th}}$ state${E_n} = - \frac{{13.6}}{{{n^2}}}\,eV$)

Two identical metal plates shown photoelectric effect by a light of wavelength $\lambda \mathop A\limits^ \circ$ falls on plate A and ${\lambda _B}$ on plate $B\left( {{\lambda _A} = 2{\lambda _B}} \right).$ The maximum kinetic energy is

If the wavelength of incident light changes from 400 nm to 300 nm, the stopping potential for photoelectrons emitted from a surface becomes approximately

If the wavelength of incident light changes from 400 nm to 300 nm, the stopping potential for photoelectrons emitted from a surface becomes approximately

Kinetic energy of emitted cathode rays is dependent on

Work function of lithium and copper are respectively $2.3\;eV$ and $4.0\;eV.$ Which one of the metal will be useful for the photoelectric cell working with visible light $(h = 6.6 imes {10^{ - 34}}J$-$s,c = 3 imes {10^8}m/s)$

Light of wavelength $1824\;\mathop A\limits^ \circ ,$ incident on the surface of a metal, produces photo-electrons with maximum energy $5.3\;eV.$ When light of wavelength $1216\;\mathop A\limits^ \circ$ is used, the maximum energy of photoelectrons is $8.7\;eV.$ The work function of the metal surface is

Work function of a metal is $2.51\;eV.$ Its threshold frequency

Electrons ejected from the surface of a metal, when light of certain frequency is incident on it, are stopped fully by a retarding potential of 3 V. Photoelectric effect in this metallic surface begins at a frequency $6 imes {10^{14}}\;{{\rm{s}}^{ - 1}}$. The frequency of the incident light in ${{\rm{s}}^{ - 1}}$ is

[Planck’s constant = $6.4 imes {10^{ - 34}}\;{\rm{Js}},$ charge on the electron = $1.6 imes {10^{ - 19}}$C]