Question

The minimum energy that must be possessed by photons in order to produce the photoelectric effect with platinum metal is:
[Given: The threshold frequency of platinum is $1.3$ $\times 10^{15} \,s ^{-1}$ and $\left.h =6.6 \times 10^{-34}\, J s .\right]$

• A. $3.21 \times 10^{-14} J$
• B. $6.24 \times 10^{-16} J$
• C. $8.58 \times 10^{-19} J$
• D. $9.76 \times 10^{-20} J$

Answer 1

Answer: (C)

$W = h v $
$=6.6 \times 10^{-34} \times 1.3 \times 10^{15} $
$=8.58 \times 10^{-19}\, J $