The wavelength of a ruby laser is 694.3 nm. What is the energy ...

[rmenurse]

The wavelength of a ruby laser is 694.3 nm.
 
  What is the energy difference between the two energy states involved in laser action? (c = 2.9979  108 m/s, h = 6.626  10-34 J  s, 1 eV = 1.6022  10-19 J)
  A) 1.537 eV
  B) 1.646 eV
  C) 1.786 eV
  D) 1.812 eV
  E) 3.572 eV

Question 2

According to the second law of thermodynamics, the entropy of any system always increases.
 
  A) True B) False

[steff9894]

Answer to Question 1

C

Answer to Question 2

B

[rmenurse]

YES! Correct, THANKS for helping me on my review

[hollysheppard095]

Thanks for the timely response, appreciate it