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

Author Question: One of the absorption lines of hydrogen has a rest wavelength of 656 nm (at rest means with respect ... (Read 71 times)

rosent76

  • Hero Member
  • *****
  • Posts: 516
on: Jul 27, 2018
One of the absorption lines of hydrogen has a rest wavelength of 656 nm (at rest means with respect to the observer, like in a lab). You observe several stars and measure the wavelength of this same hydrogen absorption line in each star.
 
  Based on the measured wavelength of this line, which star is moving towards the Earth the fastest?
  A) 670 nm B) 640 nm C) 656 nm D) 630 nm E) 680 nm

Question 2

Which of the following telescopes is best suited for studying the hottest intergalactic gas (10 million K) in a cluster of galaxies?
 
  A) Very Large Array Radio Telescope
  B) Chandra X-ray Telescope
  C) Herschel Infrared Telescope
  D) Hubble Space Telescope (UV and optical and some infrared)


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

ryhom

  • Sr. Member
  • ****
  • Posts: 366
Reply #1 on: Jul 27, 2018
Answer to Question 1

D

Answer to Question 2

B


rosent76

  • Hero Member
  • *****
  • Posts: 516
Reply #2 on: Jul 27, 2018
Both answers were spot on, thank you once again


ryhom

  • Sr. Member
  • ****
  • Posts: 366
Reply #3 on: Jul 27, 2018
Great! Please up vote :D


« previous next »
 

Did you know?

Atropine was named after the Greek goddess Atropos, the oldest and ugliest of the three sisters known as the Fates, who controlled the destiny of men.

Did you know?

About 600,000 particles of skin are shed every hour by each human. If you live to age 70 years, you have shed 105 pounds of dead skin.

Did you know?

Despite claims by manufacturers, the supplement known as Ginkgo biloba was shown in a study of more than 3,000 participants to be ineffective in reducing development of dementia and Alzheimer’s disease in older people.

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.

Did you know?

Asthma cases in Americans are about 75% higher today than they were in 1980.

Digestion and absorption of emulsified fat in the small intestine. Digestion and absorption of emulsified fat in the small intestine.
This chart shows the various lines of responsibility and how they differ in presidential and parliam This chart shows the various lines of responsibility and how they differ in presidential and parliam
The absorption spectra of the three classes of cones. The absorption spectra of the three classes of cones.
Effect of pH on drug absorption. (a) A weak acid such as aspirin (ASA) is in a nonionized form in an ... Effect of pH on drug absorption. (a) A weak acid such as aspirin (ASA) is in a nonionized form in an ...
Hydrogen Bond Hydrogen Bond
Absorption spectra of chlorophylls a and b , β-carotene, and two phycobilins Absorption spectra of chlorophylls a and b , β-carotene, and two phycobilins
Video: Interspecific Competition Relationship - Competitive & Niche Differentiation

For a complete list of videos, visit our video library