A ruby laser can deliver an 8.57 J pulse in approximately 50 nanoseconds.The wavelength of the light is 694.4 nm.At least how many atoms within the ruby rod had to be excited to allow this high-energy laser pulse? (h = 6.63 x 10^-34J*s,c = 3.00 ´ 10⁸ m/s,1 eV = 1.6 x 10^-19 J,and 1 nm = 10^-9 m) A)4 x 10¹⁸ B)8 x 10¹⁸ C)3 x 10¹⁹ D)6 x 10²⁰

Question

Quizplus · Accepted Answer

The energy of a single photon is calculated using E = hc/λ. Substituting the given values, we find the energy per photon. Dividing the total energy of the pulse by the energy per photon gives the number of photons, which corresponds to the number of excited atoms.

A Ruby Laser Can Deliver an 8