Author Question: A light-emitting diode has a power output of 0.3 W. If 590 nm is the average wavelength of the ... (Read 40 times)

HCHenry · **on:** Jul 28, 2018

A light-emitting diode has a power output of 0.3 W. If 590 nm is the average wavelength of the source, about how many photons are emitted per second? (h = 6.63 10-34 Js, c = 3.00 108 m/s, and 1 nm = 10-9 m)
a. 1021
c. 1018
b. 1025
d. 1029

Question 2

Which of the following statements best describes the relation between quantum theory and the photoelectric effect experiment?
a. The photoelectric effect contradicts quantum theory.
b. Quantum theory explains the photoelectric effect.
c. Quantum theory has no bearing on the photoelectric effect.
d. The photoelectric effect explains quantum theory.