This topic contains a solution. Click here to go to the answer

Author Question: An electron is trapped in a quantum well that is 48.6 nm wide. Calculate the minimum uncertainty ... (Read 88 times)

itsmyluck

  • Hero Member
  • *****
  • Posts: 546
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



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

cici

  • Sr. Member
  • ****
  • Posts: 325
Answer to Question 1

A

Answer to Question 2

C




itsmyluck

  • Member
  • Posts: 546
Reply 2 on: Jul 29, 2018
Great answer, keep it coming :)


amandalm

  • Member
  • Posts: 306
Reply 3 on: Yesterday
YES! Correct, THANKS for helping me on my review

 

Did you know?

Malaria was not eliminated in the United States until 1951. The term eliminated means that no new cases arise in a country for 3 years.

Did you know?

Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.

Did you know?

In 1886, William Bates reported on the discovery of a substance produced by the adrenal gland that turned out to be epinephrine (adrenaline). In 1904, this drug was first artificially synthesized by Friedrich Stolz.

Did you know?

Women are 50% to 75% more likely than men to experience an adverse drug reaction.

Did you know?

According to the National Institute of Environmental Health Sciences, lung disease is the third leading killer in the United States, responsible for one in seven deaths. It is the leading cause of death among infants under the age of one year.

For a complete list of videos, visit our video library