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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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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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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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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