MCQ
The minimum energy that must be possessed by photons in order to produce the photoelectric effect with platinum metal is $....\,\times 10^{-19} \,J$

[Given: The threshold frequency of platinum is $1.3$ $\times 10^{15} \,s ^{-1}$ and $h =6.6 \times 10^{-34} \,J \,s$.]

  • A
    $32.1$
  • B
    $0.624$
  • $8.58$
  • D
    $976$

Answer

Correct option: C.
$8.58$
c
$W = h v$

$=6.6 \times 10^{-34} \times 1.3 \times 10^{15}$

$=8.58 \times 10^{-19} \,J$

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