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

Question

Quizplus · Accepted Answer

The energy of a photon can be calculated using the equation $E = \frac{hc}{\lambda}$, where $h$ is Planck's constant ($6.626 \times 10^{-34}$ Js), $c$ is the speed of light ($3.00 \times 10^8$ m/s), and $\lambda$ is the wavelength of the light (405 nm or $405 \times 10^{-9}$ m). Substituting these values into the equation gives an energy of approximately $4.91 \times 10^{-19}$ J.

A Laser Used in DVD Players Has a Wavelength of 405