What is the change in entropy of the ice when a 0.050-kg ice cube ...

[BrownTown3]

What is the change in entropy of the ice when a 0.050-kg ice cube at 0C melts? The latent heat of fusion for water is 80 cal/g.
 
  What will be an ideal response?

Question 2

The electrons in a beam are moving at 18 m/s. (melectron = 9.11  10-31 kg, h = 6.
 
  626  10-34 J  s)
  (a) What is its de Broglie wavelength these electrons?
  (b) If the electron beam falls normally on a diffraction grating, what would have to be the spacing between slits in the grating to give a first-order maximum at an angle of 30 with the normal to the grating?

[lorealeza77]

Answer to Question 1

15 cal/K

Answer to Question 2

(a) 40 m (b) 81 m

[BrownTown3]

Excellent

[essyface1]

Thanks for the timely response, appreciate it