A material has an energy gap of 2.5 eV. What energy photons in ...

[newbem]

A material has an energy gap of 2.5 eV. What energy photons in the visible range (1.8 eV to 3.6 eV) would excite electrons into the conduction band?
 
  A)
 
  1.8 eV
  B)
 
  2.5 eV
  C)
 
  1.8 eV up to 2.5 eV
  D)
 
  2.5 eV up to 3.6 eV
  E)
 
  1.5 eV

Question 2

Consider a spherical Gaussian surface of radius R centered at the origin. A charge Q is placed inside the sphere. Where should the charge be located to maximize the magnitude of the flux of the electric field through the Gaussian surface?
 
  A)
 
  at x = 0, y = 0, z = R/2
  B)
 
  at the origin
  C)
 
  at x = R/2, y = 0, z = 0
  D)
 
  at x = 0, y = R/2, z = 0
  E)
 
  The flux does not depend on the position of the charge as long as it is inside the sphere

[meganlapinski]

Answer to Question 1

D

Answer to Question 2

E

[newbem]

Thank you!

[meganlapinski]

Always glad to help...