Answer:
E = 0.14 ×10⁻¹⁷ J
Explanation:
Given data:
Wavelength of light = 142 nm (142 ×10⁻⁹ m)
Energy of light = ?
Solution:
Formula:
E = hc/λ
h = plancks constant = 6.63×10⁻³⁴ Js
c = speed of light = 3×10⁸ m/s
by putting values
E = 6.63×10⁻³⁴ Js × 3×10⁸ m/s / 142 ×10⁻⁹ m
E = 19.89×10⁻²⁶ J.m/ 142 ×10⁻⁹ m
E = 0.14 ×10⁻¹⁷ J
