Solution

$1\ eV = 1.6 \times 10^{-19}$ J ⇒ $1\ J = \frac{1}{1.6 \times 10^{-19}}$ eV $10^{-20}\ J = \frac{10^{-20}}{1.6 \times 10^{-19}}$ eV $= 0.0625$ eV ≈ 0.06 eV

Concept converting joules to electron volts

Units and Measurements in past papers

53 questions from this chapter have appeared across 25 exam years.