A laser used in DVD players has a wavelength of 405 nm.What is the energy of this light in joules? A)4.91 x 10^-²⁸ J B)4.91 x 10^-¹⁹ J C)8.05 x 10^-³² J D)8.05 x 10^-²³ J E)2.98 x 10^-⁴⁸ J

Question

Quizplus · Accepted Answer

The energy of a photon is calculated using the formula E = hc/λ, where h is Planck's constant (6.626 x 10^-34 J·s), c is the speed of light (3.00 x 10^8 m/s), and λ is the wavelength in meters (405 nm = 405 x 10^-9 m). Substituting these values gives approximately 4.91 x 10^-19 J.

A Laser Used in DVD Players Has a Wavelength of 405