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Dual Nature of Radiation and Matter — Physics STD 12 — Question

Tamilnadu BoardEnglish MediumSTD 12PhysicsDual Nature of Radiation and Matter1 Mark
MCQ
The work function of a photoelectric material is $3.3 eV.$ The threshold frequency will be equal to
  • ✓
    $8 \times 10^{14} Hz$
  • B
    $8 \times 10^{10} Hz$
  • C
    $5 \times 10^{20} Hz$
  • D
    $4 \times 10^{14} Hz$
✓

Answer

Correct option: A.
$8 \times 10^{14} Hz$
$8 \times 10^{14} Hz$
Solution:
$W = h v_0 \quad \text{v}_0$
$=\frac{ W }{ h }=\frac{3.3 eV }{6.6 \times 10^{-34}} $
$=\frac{3.3 \times 1.6 \times 10^{-19}}{6.6 \times 10^{-34}} $
$v_{ o }=8 \times 10^{14} Hz$

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