Answer:
276 nm
Explanation:
The equation relating the energy (E) and the wavelength (λ) of a wave is
E = (hc)/λ Multiply both sides by λ
Eλ = hc Divide both sides by E
λ = (hc)/E
h = 6.626 × 10⁻³⁴ J·s
c = 2.998 × 10⁸ m·s⁻¹
E = 7.21 × 10⁻¹⁹ J Calculate the wavelength
λ = (6.626 × 10⁻³⁴ × 2.998 × 10⁸)/7.21 × 10⁻¹⁹
λ = 2.76 × 10⁻⁷ m = 276 × 10⁻⁹ m = 276 nm
