Question

An energy of $13.6 \,eV$ is equal to

• A. $0.518 \times 10^{-25} kcal$
• B. $6.04 \times 10^{-25} kWh$
• C. $2.17 \times 10^{-10} J$
• D. $2.17 \times 10^{-15} kN - m$

Answer 1

Answer: (B)

$E=13.6 \,eV$
$=13.6 \times 1.6 \times 10^{-19}\, J $ (or W-s)
$=21.76 \times 10^{-19} \,W - s$
$=\frac{21.76 \times 10^{-19}}{1000 \times 60 \times 60} \,kW - h$
$=6.04 \times 10^{-25} \,kW - h$