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Author Question: The half-life of a radioactive material is 4.5 days. How many days are required for a sample, with ... (Read 121 times)

big1devin

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The half-life of a radioactive material is 4.5 days. How many days are required for a sample, with an initial activity of 1.0  105 Bq, to decay to an activity of 100 Bq?
 
  A) 45 days
  B) 36 days
  C) 54 days
  D) 31 days

Question 2

What frequency must a photon have to change the energy of a hydrogen atom from the n = 2 to the n = 4 state? (h = 6.626  10-34 J  s, 1 eV = 1.60  10-19 J)
 
  A) 3.06  1014 Hz
  B) 6.16  1014 Hz
  C) 4.11  1014 Hz
  D) 5.20  1014 Hz
  E) 9.24  1014 Hz


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kaykay69

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big1devin

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Reply 2 on: Jul 29, 2018
Gracias!


cici

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Reply 3 on: Yesterday
YES! Correct, THANKS for helping me on my review

 

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