The concentration of photons in a uniform light beam with a wavelength of 500 nm is 1.7 *10¹³ m ^- ³.The intensity of the beam is: A)6.8 * 10 ^- ⁶ W/m² B)3.2* 10² W/m² C)1.0 * 10³ W/m² D)2.0 *10³ W/m² E)4.0 F*10³ W/m²

Question

Quizplus · Accepted Answer

The intensity of a light beam is given by the product of the photon concentration, the energy of each photon, and the speed of light. The energy of a photon is calculated using E = hc/λ, where h is Planck's constant, c is the speed of light, and λ is the wavelength. Substituting the given values and calculating gives an intensity of approximately 2.0 x 10^3 W/m^2.

The Concentration of Photons in a Uniform Light Beam with a Wavelength