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Author Question: A solid metal sphere is 15.0 cm in diameter and has surface of uniform color. When its surface is at ... (Read 65 times)

yoroshambo

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on: Jul 29, 2018
A solid metal sphere is 15.0 cm in diameter and has surface of uniform color. When its surface is at 112C, you measure that it radiates energy at a rate of 71.3 W.
 
  What is the emissivity of the surface of this object? Any heat that enters the sphere from the outside environment is negligible. The Stefan-Boltzmann constant is 5.670  10-8 W/m2  K4.

Question 2

Light from a 600 nm source goes through two slits 0.080 mm apart. What is the angular separation of the two first order maxima occurring on a screen 2.0 m from the slits?
 
  A) 0.15
  B) 0.86
  C) 0.015
  D) 0.0075
  E) 1.75


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ky860224

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

0.81

Answer to Question 2

B


yoroshambo

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Reply 2 on: Jul 29, 2018
Gracias!

chereeb

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Reply 3 on: Yesterday
Excellent

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