Q189 / 200 · Manipal (MET) 2011 · Physics

For germanium crystal, the forbidden energy gap in joule is

  • Correct answer
    A
    $1.216 \times 10^{-19}$
  • B
    $1.76 \times 10^{-19}$
  • C
    $1.6 \times 10^{-19}$
  • D
    zero

Solution

Forbidden energy gap for germanium crystal $\begin{aligned} & =0.76 \mathrm{eV} \\ & =0.76 \times 1.6 \times 10^{-19} \mathrm{~J} \\ & =1.216 \times 10^{-19} \mathrm{~J}\end{aligned}$

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

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