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

Author Question: The design of modern X-ray telescopes depends on A) lenses made of germanium. B) the prime focus ... (Read 194 times)

Metfan725

  • Hero Member
  • *****
  • Posts: 552
on: Jul 27, 2018
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
Reply #1 on: Jul 27, 2018
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
Reply #2 on: Jul 27, 2018
Both answers were spot on, thank you once again


popopong

  • Sr. Member
  • ****
  • Posts: 307
Reply #3 on: Jul 27, 2018
Great! Please up vote :D


« previous next »
 

Did you know?

Many medications that are used to treat infertility are injected subcutaneously. This is easy to do using the anterior abdomen as the site of injection but avoiding the area directly around the belly button.

Did you know?

Lower drug doses for elderly patients should be used first, with titrations of the dose as tolerated to prevent unwanted drug-related pharmacodynamic effects.

Did you know?

The most destructive flu epidemic of all times in recorded history occurred in 1918, with approximately 20 million deaths worldwide.

Did you know?

Less than one of every three adults with high LDL cholesterol has the condition under control. Only 48.1% with the condition are being treated for it.

Did you know?

Eating food that has been cooked with poppy seeds may cause you to fail a drug screening test, because the seeds contain enough opiate alkaloids to register as a positive.

Despite the traditional focus on males, females actively choose mates and are the driving force in t Despite the traditional focus on males, females actively choose mates and are the driving force in t
Compared with modern humans, Homo erectus has a larger face, lacks a chin and canine fossa, and has Compared with modern humans, Homo erectus has a larger face, lacks a chin and canine fossa, and has
Modern Human Fossil Sites in the Old World Modern Human Fossil Sites in the Old World
Early in the twentieth century, when malnutrition was common, companies such as this one advertised Early in the twentieth century, when malnutrition was common, companies such as this one advertised
A backpressure tool can be made by using an oxygen sensor housing and using epoxy or braze to hold ... A backpressure tool can be made by using an oxygen sensor housing and using epoxy or braze to hold ...
Beef Prime Rib Beef Prime Rib
Video: Proteins Defined, Hierarchy & Composition of Cells

For a complete list of videos, visit our video library