Radiation of wavelength $$280~\text{nm}$$ is used in an experiment of photoelectric effect with cathode of work function, $$2.5~\text{eV}.$$ The maximum kinetic energy of the photoelectrons is [Take $$h=6.62\times10^{-34}~\text{J s}$$ and $$c=3\times10^{8}~\text{ms}^{-1}$$]:
1. $$4.4~\text{eV}$$
2. $$7.103\times10^{-15}~\text{J}$$
3. $$1.9~\text{eV}$$
4. $$4.60~\text{eV}$$
Subtopic: Â Einstein's Photoelectric Equation |
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From NCERT
NEET - 2024
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When two monochromatic lights of frequency, $$\nu$$ and $$\frac{\nu}{2}$$ are incident on a photoelectric metal, their stopping potential becomes $$\frac{V_{s}}{2}$$ and $$V_s$$, respectively. The threshold frequency for this metal is:
 1 $$\frac{3}{2} \nu$$ 2 $$2\nu$$ 3 $$3\nu$$ 4 $$\frac{2}{3} \nu$$
Subtopic: Â Einstein's Photoelectric Equation |
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From NCERT
NEET - 2022
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The light rays having photons of energy $$4.2~\text{eV}$$ are falling on a metal surface having a work function of $$2.2~\text{eV}.$$ The stopping potential of the surface is:
 1 $$2~\text{eV}$$ 2 $$2~\text{V}$$ 3 $$1.1~\text{V}$$ 4 $$6.4~\text{V}$$
Subtopic: Â Einstein's Photoelectric Equation |
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NEET - 2022
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The threshold frequency of a photoelectric metal is $$\nu_0.$$ If the light of frequency $$4\nu_0$$ is incident on this metal, then the maximum kinetic energy of emitted electrons will be:
 1 $$h\nu_0$$ 2 $$2h\nu_0$$ 3 $$3h\nu_0$$ 4 $$4h\nu_0$$
Subtopic: Â Einstein's Photoelectric Equation |
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From NCERT
NEET - 2022
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