What is the phase difference in a Young's double slit experiment ...

[Coya19@aol.com]

What is the phase difference in a Young's double slit experiment where the intensity is half that of the central maximum?
 
  A)
 
  45
  B)
 
  180
  C)
 
  90
  D)
 
  23
  E)
 
  245

Question 2

How much heat is required to change 456 g of ice at -25.0C into water at 25.0C? The specific heat of ice is 2090 J/(kgK)and the latent heat of fusion of water is 33.5  104 J/kg.
 
  A)
 
  224 kJ
 
  B)
 
  153 kJ
 
  C)
 
  112 kJ
 
  D)
 
  71.5 kJ
 
  E)
 
  72.5 kJ

[beccamahon]

Answer to Question 1

C

Answer to Question 2

A

[Coya19@aol.com]

Wow, this really help

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Thanks for the timely response, appreciate it