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Author Question: The mean life (time constant) of radon-222 is 5.526 d. If a sample of radon initially contains 6.00 ... (Read 56 times)

panfilo

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on: Jul 29, 2018
The mean life (time constant) of radon-222 is 5.526 d. If a sample of radon initially contains 6.00  108 radon atoms, how many of them are left after 10.0 d?
 
  A) 9.82  107
  B) 7.67  107
  C) 8.34  108
  D) 7.29  108
  E) 8.56  108

Question 2

Suppose that the speed of an electron traveling 1.0 km/s is known to an accuracy of 1 part in 10,000 (that is, within 0.01).
 
  What is the minimum uncertainty in the position of this electron? (melectron = 9.11  10-31 kg, h = 6.626  10-34 J  s)


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bdobbins

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

A

Answer to Question 2

1.2 mm


panfilo

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Reply 2 on: Jul 29, 2018
Gracias!

sarah_brady415

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Reply 3 on: Yesterday
Wow, this really help

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