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Author Question: An electron is trapped in a quantum well that is 48.6 nm wide. Calculate the minimum uncertainty ... (Read 49 times)

itsmyluck

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on: Jul 29, 2018
An electron is trapped in a quantum well that is 48.6 nm wide.
 
  Calculate the minimum uncertainty in its velocity. (h = 6.626  10-34 J  s, melectron = 9.11  10-31 kg)
  A) 2.38  103 m/s
  B) 1.01  103 m/s
  C) 3.34  104 m/s
  D) 1.79  104 m/s
  E) 7.49  103 m/s

Question 2

A giant star in another galaxy exploded 67 million years ago, forming a supernova. The event is observed by an astronomer on Earth.
 
  Estimate the speed at which the supernova (and its galaxy) recedes from Earth if the Hubble constant is 22 km/s per million light-years. (c = 3.00  108 m/s, 1 ly = 9.461  1015 m, 1 y = 3.156  107 s)
  A) 4700 km/s B) 2700 km/s C) 1500 km/s D) 1200 km/s E) 670 km/s


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cici

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

A

Answer to Question 2

C


itsmyluck

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Reply 2 on: Jul 29, 2018
YES! Correct, THANKS for helping me on my review

rachel

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Reply 3 on: Yesterday
Thanks for the timely response, appreciate it

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