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JIPMER 2014
Exam
JIPMER
Year
2014
Subject
Physics
Chapter
Dual Nature of Matter

JIPMER 2014 · Physics · Dual Nature of Matter

Work function of a metal is 5.2 × 10^ -18 , then its threshold...

Work function of a metal is 5.2×10−185.2 \times 10^{-18}, then its threshold wavelength will be

Options

  1. A736.7A˚736.7 Å
  2. B760.7A˚760.7 Å
  3. C301A˚301 Å
  4. D344.4A˚344.4 Å

Correct answer

D. 344.4A˚344.4 Å

Step-by-step solution

Work function W=hcλW=\frac{h c}{\lambda}λ=hcW=6.6×10−34×3×1085.26×10−18=344.4A˚\begin{aligned} \lambda & =\frac{h c}{W} \\ & =\frac{6.6 \times 10^{-34} \times 3 \times 10^8}{5.26 \times 10^{-18}}=344.4 Å\end{aligned}$$
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