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11. Dual nature of radiation and matter — Physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 SciencePhysics11. Dual nature of radiation and matter1 Mark
MCQ
Given figure shows few data points in a photo electric effect experiment for a certain metal. The minimum energy for ejection of electron from its surfface is$.......eV$

(Plancks constant $\left. h =6.62 \times 10^{-34}\, J . s \right)$

  • ✓
    $2.27$
  • B
    $2.59$
  • C
    $1.93$
  • D
    $2.10$
✓

Answer

Correct option: A.
$2.27$
a
Graph of $V_{s}$ and $f$ given $(B\,5.5,0)$

$hv =\phi+ eV _{ s }$

at $B \quad V _{ s }=0, \quad v=5.5$

$\Rightarrow \quad h \times 5.5 \times 10^{14}=\phi$

$\phi=\frac{6.62 \times 10^{-34} \times 5.5 \times 10^{14}}{1.6 \times 10^{-19}} eV =2.27 eV$

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