Q61 / 90 · JEE Main 2024 (06 Apr Shift 1) · Physics

In photoelectric experiment energy of $2.48 \mathrm{eV}$ irradiates a photo sensitive material. The stopping potential was measured to be $0.5 \mathrm{~V}$. Work function of the photo sensitive material is :

  • A
    $1.68 \mathrm{eV}$
  • B
    $2.48 \mathrm{eV}$
  • Correct answer
    C
    $1.98 \mathrm{eV}$
  • D
    $0.5 \mathrm{eV}$

Solution

$\begin{aligned} & \mathrm{eV} \mathrm{V}_{\mathrm{s}}=\mathrm{h} \nu-\phi \\ & 0.5 \mathrm{~V}=2.48-\phi \\ & \text { work function }(\phi)=2.48 \mathrm{~V}-0.5 \mathrm{~V}=1.98 \mathrm{~V}\end{aligned}$

Hence, the correct answer is option: 'C'.

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