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Author Question: Recall that an up quark (u) has a charge of +2/3 and a down quark (d) has a charge of -1/3. Which of ... (Read 304 times)

kaid0807

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on: Jul 27, 2018
Recall that an up quark (u) has a charge of +2/3 and a down quark (d) has a charge of -1/3. Which of the following quark compositions describes a proton?
 
  A) uuu
  B) uud
  C) udd
  D) uuudd

Question 2

The first multicellular organism appears around
 
  A) 542 million years ago
  B) 1.2 billion years ago
  C) 65 million years ago
  D) 3.5 billion years ago


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jasonq

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Reply #1 on: Jul 27, 2018
Answer to Question 1

B

Answer to Question 2

B


kaid0807

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Reply 2 on: Jul 27, 2018
YES! Correct, THANKS for helping me on my review

xiaomengxian

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Reply 3 on: Yesterday
Wow, this really help

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