Planck's constant is h = 6.6 × 10^-34 Js. Light of wavelength 5 × 10^-7 m consists of photons whose energy is A) 1.1 × 10^-48 J. B) 1.3 × 10^-27 J. C) 4 × 10^-19 J. D) 1.7 × 10^-15 J.

Question

Quizplus · Accepted Answer

The energy of a photon is given by E = hc/λ, where h is Planck's constant, c is the speed of light (approximately 3 × 10^8 m/s), and λ is the wavelength. Substituting the given values, E = (6.6 × 10^-34 Js)(3 × 10^8 m/s) / (5 × 10^-7 m) = 4 × 10^-19 J.

Planck's Constant Is H = 6