Answer Happy

Question 2 1 pts A 160.2-W light source is known to emit colored light at a wavelength of 587.6 nm. If this light source is used for 64 minutes, how many moles photons were emitted during this use? Round your final answer to three significant figures. D Question 3 1 pts A photon with a wavelength of 56.86 nm was used to induce the photoelectric effect on a metal surface. If the emitted electron has a measured velocity of 8.15 X 105 m/s, how much energy, in eV, was needed to remove the electron from the metal surface? Hints • KE = 1/2 m v2 • 1 eV = 1.602 X 10-19 J mass of an electron is 9.109 X 10-31 kg