Answer:
E = 0.024 ×10⁻¹⁷ J
Explanation:
Given data:
Wavelength of photon = 821 nm (821 ×10⁻⁹ m)
Energy of photon = ?
Solution:
Formula:
E = hc/λ
h = plancks constant = 6.626×10⁻³⁴ Js
c = speed of light = 3×10⁸ m/s
by putting values
E = 6.626×10⁻³⁴ Js × 3×10⁸ m/s / 821 ×10⁻⁹ m
E = 19.878×10⁻²⁶ J.m/ 821 ×10⁻⁹ m
E = 0.024 ×10⁻¹⁷ J
