iran-konkur 2023 Q59

iran-konkur · Other · konkur-riazi_1402_tir_specialized Not Maths
59. In a photoelectric device, the work function of metal $Z$ is $4\,\text{eV}$. We perform two experiments with this device. In the second experiment, we use half the wavelength of the incident light, and the maximum kinetic energy of the photoelectrons is 6 times that of the first experiment. What is the wavelength of the light used in the first experiment in nanometers? ($c = 3\times10^{8}\,\dfrac{\text{m}}{\text{s}}$ and $h = 4\times10^{-15}\,\text{eV·s}$)
  • [(1)] 180
  • [(2)] 240
  • [(3)] 360
  • [(4)] 480 
\textbf{59.} In a photoelectric device, the work function of metal $Z$ is $4\,\text{eV}$. We perform two experiments with this device. In the second experiment, we use half the wavelength of the incident light, and the maximum kinetic energy of the photoelectrons is 6 times that of the first experiment. What is the wavelength of the light used in the first experiment in nanometers? ($c = 3\times10^{8}\,\dfrac{\text{m}}{\text{s}}$ and $h = 4\times10^{-15}\,\text{eV·s}$)

\begin{itemize}
    \item[(1)] 180
    \item[(2)] 240
    \item[(3)] 360
    \item[(4)] 480
\end{itemize}
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