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Author Question: A helium-neon laser ( = 632.8 nm) is used to calibrate a diffraction grating. If the first-order ... (Read 89 times)

craiczarry

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on: Jul 28, 2018
A helium-neon laser ( = 632.8 nm) is used to calibrate a diffraction grating. If the first-order maximum occurs at 20.5, what is the line spacing, d?
 a. 1.81  106 m
  b. 1.00  105 m
  c. 1.00  104 m
  d. 1.31  106 m
  e. 6.76  107 m

Question 2

The direction of the Moon's orbit about Earth is
 a. westward.
  b. eastward.
  c. clockwise, as viewed from above Earth's North Pole.
  d. none of these.


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Kdiggy

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

a

Answer to Question 2

b


craiczarry

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Reply #2 on: Jul 28, 2018
TY


Kdiggy

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


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