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Author Question: A star is moving toward Earth at 90 the speed of light. The star emits light, which moves away from ... (Read 137 times)

tfester

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on: Jul 29, 2018
A star is moving toward Earth at 90 the speed of light. The star emits light, which moves away from the star at the speed of light. What do Earth-based astronomers measure for the speed of this light?
 
  A) c
  B) 1.9c
  C) 1.2c
  D) 0.98c
  E) 0.95c

Question 2

In the vicinity of what frequency does an object with a temperature of 1000 K radiate the largest amount of power? (c = 3.00  108 m/s,
 
  Wien displacement law constant equals 2.90  10-3 m  K,
   = 5.670  10-8 W/m2  K4)
  A) 1.0  1014 Hz
  B) 8.0  1014 Hz
  C) 2.3  1014 Hz
  D) 6.7  1014 Hz
  E) 4.1  1014 Hz


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janieazgirl

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

A

Answer to Question 2

A


tfester

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Reply 2 on: Jul 29, 2018
Excellent

xiazhe

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Reply 3 on: Yesterday
Gracias!

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