A ray of light traveling in air makes a 63.0 angle with respect ...

[geoffrey]

A ray of light traveling in air makes a 63.0 angle with respect to the normal of the surface of a liquid. It travels in the liquid at a 39.2 angle with respect to the normal.
 
  Find the critical angle for total internal reflection for this interface.

Question 2

A particle physicist observes cosmic rays creating a new particle high in the atmosphere, and the speed of this particle is measured at 99.7 the speed of light.
 
  It is unstable, and is observed to decay in an average 37.0 s. If this particle were at rest in the laboratory, what would be its average lifetime?
  A) 2.9 s
  B) 18 s
  C) 5.3 s
  D) 12 s
  E) 4.3 s

[randomguy133]

Answer to Question 1

45.2

Answer to Question 2

A

[geoffrey]

Both answers were spot on, thank you once again

[randomguy133]

Great! Please up vote