Unit 2

Question 1

The function of the _____ in a refracting telescope is to gather more light than is possible for the human eye.

Answer 1

objective lens

Question 2

The process by which a very large radio dish may be simulated is called _____.

Answer 2

interferometry

Question 3

Any heated object emits _____ radiation.

Answer 3

infrared

Question 4

A(n) _____ is the distance between two equal parts on consecutive wave forms.

Answer 4

wavelength

Question 5

The _____ lens is a convex and concave lens placed back to back that improves the quality of the refractor telescopes.

Answer 5

compound

Question 6

Who created the reflecting telescope because he believed chromatic aberration in refractors would never be overcome?

Answer 6

Isaac Newton

Question 7

Gamma rays are formed in stars’ cores as a result of _____.

Answer 7

fusion

Question 8

_____ is the change in light waves passing near the edges of a gap.

Answer 8

diffraction

Question 9

Electromagnetic waves only differ from one another in _____.

Answer 9

wavelength

Question 10

The _____ telescope made the telescope easier to use by cutting the length of tube needed in half.

Answer 10

cassegrain

Question 11

A _____ is both a particle and a wave.

Answer 11

photon

Question 12

All _____ carries clues to what sort of event produced it.

Answer 12

electromagnetic radiation

Question 13

_____ means pertaining to color.

Answer 13

chromatic

Question 14

The front lens of a reflecting telescope is the _____ lens.

Answer 14

objective

Question 15

_____ is the change in direction from one medium to another of different density.

Answer 15

refraction

Question 16

The _____ can collect light from very dim objects over many hours.

Answer 16

CCD and camera

Question 17

Who invented the compound or achromatic lens?

Answer 17

chester hall

Question 18

A photon is a unit of _____ energy.

Answer 18

radiant

Question 19

Who proposed the multiple telescope?

Answer 19

edward synge

Question 20

The modern preferred means of producing a visible spectrum is a _____.

Answer 20

diffraction grating

Question 21

Who brought forth the electromagnetic theory of light?

Answer 21

james maxwell

Question 22

One major goal of radio astronomy is to match detected radio _____ with the conditions and processes that produce them.

Answer 22

waves

Question 23

A special curve looking like the inside of a bowl is said to be _____.

Answer 23

parabolic

Question 24

CCD stands for _____.

Answer 24

charge-coupled device

Question 25

What is a disadvantage of the CCD?

Answer 25

It can only collect images of a very small slice in one exposure.

Question 26

_____ means to issue forth from a center.

Answer 26

radiate

Question 27

Who discovered two of Saturn’s moons?

Answer 27

william herschel

Question 28

A(n) _____ telescope receives, amplifies, and preserves radio signals.

Answer 28

radio

Question 29

In _____, an information processor delays signals from distant receivers so all signals arrive together.

Answer 29

interferometry

Question 30

The rear lens of a refracting telescope is the _____.

Answer 30

eyepiece

Question 31

An electromagnetic wave consists of a(n) _____ wave moving together, while being oriented 90° to each other.

Answer 31

electrical and magnetic

Question 32

A(n) _____ is an intervening substance through which an effect may be transported.

Answer 32

medium