Author Question: A laser emits light of wavelength 463 nm during a brief pulse that lasts for 25 ms and has a total ... (Read 33 times)

darbym82 · **on:** Jul 29, 2018

A laser emits light of wavelength 463 nm during a brief pulse that lasts for 25 ms and has a total energy of 1.2 J. How many photons are emitted in that single pulse? (c = 3.00 108 m/s, h = 6.626 10-34 J s)

A) 2.2 1017 B) 3.4 1019 C) 2.8 1018 D) 6.9 1019 E) 1.1 1017

Question 2

A series circuit contains a 1.0-k resistor, a 5.0-mH inductor, and an ideal 25-V power supply. What is the time constant for the circuit?

A) 1.6 s B) 1.6 s C) 5.0 s D) 5.0 s