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

Author Question: The apparent brightness of a star is 1.0 10-12 W/m2 and the peak wavelength is 600 nm. Estimate its ... (Read 66 times)

torybrooks

  • Hero Member
  • *****
  • Posts: 500
on: Jul 29, 2018
The apparent brightness of a star is 1.0  10-12 W/m2 and the peak wavelength is 600 nm. Estimate its distance from us.
 
  A)
 
  0.090 pc
  B)
 
  0.90 pc
  C)
 
  9.0 pc
  D)
 
  90 pc
  E)
 
  900 pc

Question 2

Assume a proton in a 1-dim box of width 3.0 fm is in its 1 st excited state. (a) What is its kinetic energy (in eV)? (b) How close (fm) to the wall of the box is the probability density a maximum?
 
  What will be an ideal response?


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

Jordin Calloway

  • Sr. Member
  • ****
  • Posts: 334
Reply #1 on: Jul 29, 2018
Answer to Question 1

D

Answer to Question 2

(a) 91. MeV
(b) 0.75 fm


torybrooks

  • Member
  • Posts: 500
Reply 2 on: Jul 29, 2018
Thanks for the timely response, appreciate it

juliaf

  • Member
  • Posts: 344
Reply 3 on: Yesterday
Gracias!

« previous next »
 

Did you know?

In the ancient and medieval periods, dysentery killed about ? of all babies before they reach 12 months of age. The disease was transferred through contaminated drinking water, because there was no way to adequately dispose of sewage, which contaminated the water.

Did you know?

Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.

Did you know?

Cocaine was isolated in 1860 and first used as a local anesthetic in 1884. Its first clinical use was by Sigmund Freud to wean a patient from morphine addiction. The fictional character Sherlock Holmes was supposed to be addicted to cocaine by injection.

Did you know?

The first oral chemotherapy drug for colon cancer was approved by FDA in 2001.

Did you know?

Malaria mortality rates are falling. Increased malaria prevention and control measures have greatly improved these rates. Since 2000, malaria mortality rates have fallen globally by 60% among all age groups, and by 65% among children under age 5.

A crescent Moon and "star" A crescent Moon and "star"
The Structure of an Old High-Mass Star The Structure of an Old High-Mass Star
Albert Bierstadt, The Rocky Mountains, Lander's Peak, (detail). Albert Bierstadt, The Rocky Mountains, Lander's Peak, (detail).
A typical peak-and-hold fuel-injector waveform. Most fuel injectors that measure less than 6 ohms ... A typical peak-and-hold fuel-injector waveform. Most fuel injectors that measure less than 6 ohms ...
In plant fossils, stomatal density is used to estimate CO2 concentration in the atmosphere In plant fossils, stomatal density is used to estimate CO2 concentration in the atmosphere
A wave whose wavelength is 0.500 m is traveling down a 500-m long wire whose total mass is 25 ... A wave whose wavelength is 0.500 m is traveling down a 500-m long wire whose total mass is 25 ...
Video: Primary Active Transport - electrochemical gradient and ion transport / water movement

For a complete list of videos, visit our video library