A laser emits light of wavelength 463 nm during a brief pulse ...

[darbym82]

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

[alvinum]

Answer to Question 1

C

Answer to Question 2

D

[darbym82]

Thanks for the timely response, appreciate it

[frankwu0507]

Excellent