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Author Question: Light of wavelength 575 nm passes through a double-slit and the third order bright fringe is seen at ... (Read 140 times)

crazycityslicker

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on: Jul 29, 2018
Light of wavelength 575 nm passes through a double-slit and the third order bright fringe is seen at an angle of 6.5 away from the central fringe. What is the separation between the double slits?
 
  A) 5.0 m
  B) 10 m
  C) 15 m
  D) 20 m
  E) 25 m

Question 2

A blacksmith is flattening a steel plate that measures 10 cm  15 cm  1 mm. He has heated the plate to 900 K. If the emissivity of the plate is 0.75,
 
  what is the total rate at which it radiates energy? The Stefan-Boltzmann constant is 5.670  10-8 W/m2  K4. Ignore any heat it receives from the surroundings.
  A) 360 W
  B) 760 W
  C) 790 W
  D) 850 W
  E) 880 W


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heyhey123

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

C

Answer to Question 2

D


crazycityslicker

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Reply #2 on: Jul 29, 2018
Thanks


heyhey123

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Reply #3 on: Jul 29, 2018
Welcome :)


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