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11.Dual Nature of Radiation and matter
easy
The photo-electrons emitted from a surface of sodium metal are such that
A
They all are of the same frequency
B
They have the same kinetic energy
C
They have the same de Broglie wavelength
D
They have their speeds varying from zero to a certain maximum
Solution
(d) The photoelectric effect related with the incident light frequency ( $v$ ) by the following equation:
$E_{k}=e V_{s}=h \nu-\phi$
where $\phi$ is the work function of the material and $E_{k}$ is the kinetic energy of the photo electron. So the photoelectrons emitted from the surface of sodium metal are of speeds from zero to a certain maximum depending on the incident photon energy.
Standard 12
Physics