Telescopes

Question 1

What is a telescope

Answer 1

A device that collects light and brings it into focus

Question 2

Does a telescope use lenses or mirrors

Answer 2

Either

Question 3

What are the two basic telescope types

Answer 3

Refractor or reflector

Question 4

What is refraction

Answer 4

When Light bends when it encounters matter

Question 5

What are rainbows

Answer 5

Sunlight when it gets refracted by water droplets

Question 6

What are problems with refracting telescopes

Answer 6

Very hard and expensive to make, chromatic aberration, large lenses are heavy, both sides must be shaped perfectly

Question 7

What is chromic aberration

Answer 7

Different wavelengths of light are focused at slightly different points

Question 8

What is the worlds largest refracting telescope

Answer 8

Heroes observatory

Question 9

What is reflecting telescopes coated in

Answer 9

Aluminum, silver or gold

Question 10

What is telescope resolution

Answer 10

Measure of how small an angle a telescope can distinguish

Question 11

Issues with telescope resolution

Answer 11

When light passes through a telescope, it experiences a wave of interference (diffraction)

Question 12

When does diffraction increase

Answer 12

With longer wavelength and smaller apertures

Question 13

Where is seeing best

Answer 13

On mountain tops with unvarying high pressure systems

Question 14

How to eliminate seeing

Answer 14

Speckle, take long quick exposures of the same object and align them

Question 15

What is adaptive optics

Answer 15

Using deformable mirrors we can adopt the shape to account for distortions

Question 16

Best sites for telescopes

Answer 16

Clear weather, dry, little light pollution, little turbulence

Question 17

Where are UV telescopes

Answer 17

In space

Question 18

Where are I fared telescopes

Answer 18

As little atmosphere as possible

Question 19

Where are radio telescopes

Answer 19

The ground

Question 20

Radio telescopes must be ___ in size

Answer 20

Large bc the wavelength is so long

Question 21

Where are X-ray and gamma ray telescopes located

Answer 21

In space

Question 22

Which electromagnetic radiation creates particle showers

Answer 22

Gamma rays

Question 23

What are filters used for

Answer 23

To specifically analyze parts of the electromagnetic spectrum ( red or blue light)

Question 24

What are spectrometers

Answer 24

Diffraction grating, light passing through many slits gets dispersed into a spectrum

Question 25

What type of telescope use lenses

Answer 25

Refracting telescope

Question 26

What type of telescope uses mirrors

Answer 26

Reflecting telescope

Question 27

What is the typical unit for measuring telescope resolution

Answer 27

Arcsecond

Question 28

What technology is sometimes used to create a larger effective area for a telescope

Answer 28

Interferometry

Question 29

At makes an X-ray telescope different from a UV/ visible/ ir telescope

Answer 29

Light cannot be directly reflected and thus needs to be done at a very large angle

Question 30

What can be used as a detector for the visible light telescope

Answer 30

CCD, Photographic plate, PMT

Question 31

What can be placed between the telescope and detector that helps get light from a more specific part of the electromagnetic spectrum

Answer 31

Filters, diffraction gratings, prisms