Dual Nature Of Matter Question 3
Question 3 - 2024 (27 Jan Shift 2)
The threshold frequency of a metal with work function $6.63 \mathrm{eV}$ is :
(1) $16 \times 10^{15} \mathrm{~Hz}$
(2) $16 \times 10^{12} \mathrm{~Hz}$
(3) $1.6 \times 10^{12} \mathrm{~Hz}$
(4) $1.6 \times 10^{15} \mathrm{~Hz}$
Show Answer
Answer: (4)
Solution:
$\phi_{0}=h v_{0}$
$6.63 \times 1.6 \times 10^{-19}=6.63 \times 10^{-34} v_{0}$
$v_{0}=\frac{1.6 \times 10^{-19}}{10^{-34}}$
$v_{0}=1.6 \times 10^{15} \mathrm{~Hz}$
