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

Author Question: The design of modern X-ray telescopes depends on A) lenses made of germanium. B) the prime focus ... (Read 170 times)

Metfan725

  • Hero Member
  • *****
  • Posts: 552
The design of modern X-ray telescopes depends on
 
  A) lenses made of germanium.
  B) the prime focus design, with mirrors made of iron.
  C) grazing incidence optics.
  D) achromatic lenses to keep the X-rays in focus.
  E) the Cassegrain design, with mirrors made of lead.

Question 2

Which is brighter in our sky, a star with apparent magnitude 2 or a star with apparent magnitude 7? By how much is the star brighter?
 
  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

popopong

  • Sr. Member
  • ****
  • Posts: 307
Answer to Question 1

C

Answer to Question 2

A star with apparent magnitude 2 is 100 times brighter than a star with apparent magnitude 7. (Five magnitudes indicates a factor-of-100 difference; larger apparent magnitude stars are always fainter.)



Metfan725

  • Hero Member
  • *****
  • Posts: 552
Both answers were spot on, thank you once again




 

Did you know?

Disorders that may affect pharmacodynamics include genetic mutations, malnutrition, thyrotoxicosis, myasthenia gravis, Parkinson's disease, and certain forms of insulin-resistant diabetes mellitus.

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?

Addicts to opiates often avoid treatment because they are afraid of withdrawal. Though unpleasant, with proper management, withdrawal is rarely fatal and passes relatively quickly.

Did you know?

The term bacteria was devised in the 19th century by German biologist Ferdinand Cohn. He based it on the Greek word "bakterion" meaning a small rod or staff. Cohn is considered to be the father of modern bacteriology.

Did you know?

In 2006, a generic antinausea drug named ondansetron was approved. It is used to stop nausea and vomiting associated with surgery, chemotherapy, and radiation therapy.

For a complete list of videos, visit our video library