Class 12PhysicsDual Nature of Radiation and matterEinstein's Photoelectric Equation and Energy Quantum of Radiation
MediumTwo identical photo-cathodes receive light of frequencies $f_1$ and $f_2$. If the velocities of the photoelectrons (of mass $m$) coming out are respectively $v_1$ and $v_2$,then:
- A$v_1 - v_2 = [\frac{2h}{m}(f_1 - f_2)]^{1/2}$
- B$v_1^2 - v_2^2 = \frac{2h}{m}(f_1 - f_2)$
- C$v_1 + v_2 = [\frac{2h}{m}(f_1 + f_2)]^{1/2}$
- D$v_1^2 + v_2^2 = \frac{2h}{m}(f_1 + f_2)$
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When a photosensitive surface is illuminated with light of wavelength $\lambda$,the stopping potential is $V$. When the same surface is illuminated by light of wavelength $2\lambda$,the stopping potential is $V/3$. The threshold wavelength for the surface is:
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