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Author Question: Given that the half-life for radium-226 is 1600 y, how long is the quarter-life (that is, the time ... (Read 134 times)

Lobcity

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on: Jul 29, 2018
Given that the half-life for radium-226 is 1600 y, how long is the quarter-life (that is, the time for the radiation to decay to one-fourth of its initial level)?
 
  What will be an ideal response?

Question 2

A round 0.85-mm-diameter hole is illuminated by infrared light of wavelength 2.5 m What is the angle of the first dark fringe in the resulting pattern?
 
  A) 4.8  10-2 degrees B) 3.6  10-3 degrees C) 0.21 degrees D) 1.2  10-2 degrees


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rekilledagain

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

3200 years

Answer to Question 2

C


Lobcity

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Reply #2 on: Jul 29, 2018
Both answers were spot on, thank you once again


rekilledagain

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Reply #3 on: Jul 29, 2018
Great! Please up vote :D


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