Question

The threshold frequency of potassium is $3\times 10^{14}$ Hz. The work function is

• A. $1.0\times 10^{19}$
• B. $2.0\times 10^{-19}$
• C. $4.0\times 10^{-19}$
• D. $0.5\times 10^{-19}$

Answer 1

Answer: (B)

$\omega =hf=6.6\times 10^{-34}\times 3\times 10^{14}=2\times 10^{-19}J$