Class 12PhysicsDual Nature of Radiation and matterEinstein's Photoelectric Equation and Energy Quantum of Radiation
EasyThe photoelectric threshold wavelength for potassium (work function being $2 \ eV$) is ........... $nm$.
- A$310$
- B$620$
- C$1200$
- D$2100$
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Similar Questions
$A$ photon of energy $hv$ is absorbed by a free electron of a metal having work function $\phi < hv$.
Easy
View SolutionThe work function of a substance is $4.0 \,eV$. The longest wavelength of light that can cause photoelectron emission from this substance is approximately ......... $nm$.
When light falls on a metal surface,the maximum kinetic energy of the emitted photo-electrons depends upon
Easy
View SolutionAssertion : Photosensitivity of a metal is high if its work function is small.
Reason : Work function $= hf_0$ where $f_0$ is the threshold frequency.
Reason : Work function $= hf_0$ where $f_0$ is the threshold frequency.
The light rays having photons of energy $4.2\,eV$ are falling on a metal surface having a work function of $2.2\,eV$. The stopping potential of the surface is $.........\,V$.
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