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Author Question: Calculate the half-value thickness (in mm) of lead if it reduces the intensity of a beam of x-rays ... (Read 157 times)

sheilaspns

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on: Jul 28, 2018
Calculate the half-value thickness (in mm) of lead if it reduces the intensity of a beam of x-rays whose wavelength is 10 pm by a factor of two. (Assume the linear absorption coefficient of lead is 43 cm1 for x-rays of wavelength 10  1012 m.)
 a. 0.24
  b. 0.20
  c. 0.12
  d. 0.16
  e. 0.18

Question 2

The most southern latitude from which an observer on Earth can see the North Star (Polaris) is
 a. 66.5S.
  b. 23.5S.
  c. 0.
  d. 23.5N.


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briezy

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Reply #1 on: Jul 28, 2018
Answer to Question 1

d

Answer to Question 2

c


sheilaspns

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Reply #2 on: Jul 28, 2018
TY


briezy

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Reply #3 on: Jul 28, 2018
You're welcome


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