This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: An electron is trapped in a quantum well that is 48.6 nm wide. Calculate the minimum uncertainty ... (Read 92 times)

itsmyluck

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


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

A

Answer to Question 2

C


itsmyluck

  • Member
  • Posts: 546
Reply 2 on: Jul 29, 2018
YES! Correct, THANKS for helping me on my review

raili21

  • Member
  • Posts: 324
Reply 3 on: Yesterday
Gracias!

« previous next »
 

Did you know?

Warfarin was developed as a consequence of the study of a strange bleeding disorder that suddenly occurred in cattle on the northern prairies of the United States in the early 1900s.

Did you know?

Limit intake of red meat and dairy products made with whole milk. Choose skim milk, low-fat or fat-free dairy products. Limit fried food. Use healthy oils when cooking.

Did you know?

Many medications that are used to treat infertility are injected subcutaneously. This is easy to do using the anterior abdomen as the site of injection but avoiding the area directly around the belly button.

Did you know?

Pink eye is a term that refers to conjunctivitis, which is inflammation of the thin, clear membrane (conjunctiva) over the white part of the eye (sclera). It may be triggered by a virus, bacteria, or foreign body in the eye. Antibiotic eye drops alleviate bacterial conjunctivitis, and antihistamine allergy pills or eye drops help control allergic conjunctivitis symptoms.

Did you know?

Children of people with alcoholism are more inclined to drink alcohol or use hard drugs. In fact, they are 400 times more likely to use hard drugs than those who do not have a family history of alcohol addiction.

An image of a streptococcus bacteria taken by a scanning electron microscope. An image of a streptococcus bacteria taken by a scanning electron microscope.
Electron microscopy of mRNA-template DNA hybrids shows that introns are spliced Electron microscopy of mRNA-template DNA hybrids shows that introns are spliced
Creed - With Arms Wide Open Creed - With Arms Wide Open
How to create a price index to calculate inflation for a basket of goods How to create a price index to calculate inflation for a basket of goods
How to calculate present value using the compound interest formula (Question 2) How to calculate present value using the compound interest formula (Question 2)
How to calculate the DRT to determine which is more effective against the pathogen How to calculate the DRT to determine which is more effective against the pathogen
Video: ACTH/Cortisol (glycogenolysis, protein catabolism, lipolysis and gluconeogenesis)

For a complete list of videos, visit our video library