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

Author Question: In a reflecting telescope the objective is a ____. a. prism b. mirror c. lens d. diffraction ... (Read 109 times)

sarasara

  • Hero Member
  • *****
  • Posts: 521
on: Jul 27, 2018
In a reflecting telescope the objective is a ____.
 
  a. prism
  b. mirror
  c. lens
  d. diffraction grating
  e. photographic plate

Question 2

A planetary nebula has a radius of 0.5 pc and is expanding at 20 km/sec. What is the approximate age of this planetary nebula? (1 pc is equal to 3 x 1013 km and 1 year is equal to 3.15 x 107 seconds.)
 
  a. 240 years
  b. 790,000 years
  c. 96,000 years
  d. 960 years
  e. 24,000 years


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

isabelt_18

  • Sr. Member
  • ****
  • Posts: 342
Reply #1 on: Jul 27, 2018
Answer to Question 1

B

Answer to Question 2

E


sarasara

  • Member
  • Posts: 521
Reply 2 on: Jul 27, 2018
Thanks for the timely response, appreciate it

juliaf

  • Member
  • Posts: 344
Reply 3 on: Yesterday
Wow, this really help

« previous next »
 

Did you know?

Certain topical medications such as clotrimazole and betamethasone are not approved for use in children younger than 12 years of age. They must be used very cautiously, as directed by a doctor, to treat any child. Children have a much greater response to topical steroid medications.

Did you know?

According to the CDC, approximately 31.7% of the U.S. population has high low-density lipoprotein (LDL) or "bad cholesterol" levels.

Did you know?

According to animal studies, the typical American diet is damaging to the liver and may result in allergies, low energy, digestive problems, and a lack of ability to detoxify harmful substances.

Did you know?

The U.S. Pharmacopeia Medication Errors Reporting Program states that approximately 50% of all medication errors involve insulin.

Did you know?

In 1885, the Lloyd Manufacturing Company of Albany, New York, promoted and sold "Cocaine Toothache Drops" at 15 cents per bottle! In 1914, the Harrison Narcotic Act brought the sale and distribution of this drug under federal control.

True-color view of Mars seen through NASA's Hubble Space Telescope in 1999 True-color view of Mars seen through NASA's Hubble Space Telescope in 1999
Replica of the telescope used by Herschel to discover Uranus Replica of the telescope used by Herschel to discover Uranus
Uranus's aurorae against its equatorial rings, imaged by the Hubble telescope. Unlike the auror Uranus's aurorae against its equatorial rings, imaged by the Hubble telescope. Unlike the auror
The same star field photographed with (a) a ground-based telescope, which is subject to poor seeing The same star field photographed with (a) a ground-based telescope, which is subject to poor seeing
Bill Viola, The Reflecting Pool. Bill Viola, The Reflecting Pool.
Video: Introduction to Sickle Cell Anemia

For a complete list of videos, visit our video library