Sketch the schematic diagram of energy transfers for a ...

[WhattoUnderstand]

Sketch the schematic diagram of energy transfers for a refrigerator or air conditioner
 
  What will be an ideal response?

Question 2

The lifetime of uranium 238 is 6.0  109 y, and that of uranium 235 is 1.0  109 y. The present abundance of uranium 238 is 140 times the abundance of uranium 235. What was the ratio of abundances 1 billion years ago?
 
  A)
 
  140:1
  B)
 
  6:1
  C)
 
  61:1
  D)
 
  161:1
  E)
 
  322:1

[enass]

Answer to Question 1

See Fig. 20-9 in the text.

Answer to Question 2

C

[WhattoUnderstand]

TYSM

[bulacsom]

Excellent