A rod has a length 2.0000 m at 20.0C. The length of the rod ...

[Pineapplelove6]

A rod has a length 2.0000 m at 20.0C. The length of the rod increases to 2.0005 m when the temperature increases to 40.0C. What is the coefficient of thermal expansion of the material from which the rod is made?
 
  A)
 
  2.00  10-5/K
  B)
 
  2.50  10-5/K
  C)
 
  1.25  10-5/K
  D)
 
  5.00  10-3/K
  E)
 
  5.00  10-5/K

Question 2

If a length of lucite that is being used as a light pipe gets wet, the critical angle
 
  A)
 
  decreases.
  B)
 
  is unaffected.
  C)
 
  doubles.
  D)
 
  is meaningless since lucite cannot be used as a light pipe.
  E)
 
  increases.

[abctaiwan]

Answer to Question 1

C

Answer to Question 2

A

[Pineapplelove6]

TYSM

[mohan]

Gracias!