A 0.600-mm diameter wire stretches 0.5 of its length when it is ...

[abern]

A 0.600-mm diameter wire stretches 0.5 of its length when it is stretched with a tension of 20 N. What is the Young's modulus of this wire?
 
  A) 5.66  1010 N/m2
  B) 3.54  109 N/m2
  C) 1.41  1010 N/m2
  D) 6.43  109 N/m2
  E) 2.78  109 N/m2

Question 2

For total internal reflection to take place, light must go from a medium of lower index of refraction to a medium of higher index of refraction.
 
  Indicate whether the statement is true or false

[kkenney]

Answer to Question 1

C

Answer to Question 2

FALSE

[abern]

Gracias!

[Bigfoot1984]

TYSM