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Author Question: Sketch the schematic diagram of energy transfers for a refrigerator or air conditioner What will ... (Read 26 times)

WhattoUnderstand

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on: Jul 29, 2018
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


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enass

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Reply #1 on: Jul 29, 2018
Answer to Question 1

See Fig. 20-9 in the text.

Answer to Question 2

C


WhattoUnderstand

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Reply 2 on: Jul 29, 2018
Excellent

xiaomengxian

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Reply 3 on: Yesterday
Wow, this really help

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