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 171 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?

Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.

Did you know?

To combat osteoporosis, changes in lifestyle and diet are recommended. At-risk patients should include 1,200 to 1,500 mg of calcium daily either via dietary means or with supplements.

Did you know?

The average adult has about 21 square feet of skin.

Did you know?

Eating carrots will improve your eyesight. Carrots are high in vitamin A (retinol), which is essential for good vision. It can also be found in milk, cheese, egg yolks, and liver.

Did you know?

A serious new warning has been established for pregnant women against taking ACE inhibitors during pregnancy. In the study, the risk of major birth defects in children whose mothers took ACE inhibitors during the first trimester was nearly three times higher than in children whose mothers didn't take ACE inhibitors. Physicians can prescribe alternative medications for pregnant women who have symptoms of high blood pressure.

For a complete list of videos, visit our video library