Light in a frozen block of ice reflects off the ice-air interface ...

[Diane]

Light in a frozen block of ice reflects off the ice-air interface and undergoes a phase shift of
 
  A) 0.
  B) 45.
  C) 90.
  D) 180.
  E) 270.

Question 2

Compared to a chemical rocket, an ion engine has a
 
  A) smaller thrust but can be operated for a longer time period
  B) smaller thrust and can only be operated for a shorter time period
  C) larger thrust and can be operated for a longer time period
  D) larger thrust but can only be operated for a shorter time period

[Zack0mack0101@yahoo.com]

Answer to Question 1

A

Answer to Question 2

A

[Diane]

Excellent

[sailorcrescent]

Gracias!