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Author Question: An electron is moving with the speed of 1780 m/s. What is its de Broglie wavelength? (melectron = ... (Read 130 times)

fagboi

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on: Jul 29, 2018
An electron is moving with the speed of 1780 m/s. What is its de Broglie wavelength? (melectron = 9.11  10-31 kg, h = 6.626  10-34 J  s)
 
  A) 409 nm
  B) 302 nm
  C) 205 nm
  D) 420 nm
  E) 502 nm

Question 2

A refrigerator has a performance coefficient (COP) of 1.15, and it extracts 7.95 J of heat from the cold reservoir during each cycle.
 
  (a) How much work is done on the gas in each cycle?
  (b) How much heat is exhausted into the hot reservoir in each cycle?


joechoochoy

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

A

Answer to Question 2

(a) 6.91 J (b) 14.9 J


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