ESC 1000 Earth Science Name:___Answers_____
Chapter 23 Part K: Key Terms
Fill in
the blanks with the word(s) that best fit the description:
1. absorption
spectrum (or
Dark-line spectrum) – A continuous spectrum with dark lines
superimposed.
2.
3. Bright-line (emission)
spectrum – The bright lines produced by an incandescent gas under
pressure.
4. Chromatic Aberration –
The property of a lens whereby light of different colors is focused at
different places.
5. Chromosphere
– The first layer of the solar atmosphere found directly above the photosphere.
6. Continuous spectrum –
An uninterrupted band of light emitted by an incandescent solid, liquid, or gas
under pressure.
7.
8. Doppler Effect – The
apparent change in wavelength of radiation caused by relative motions of the
source and the observer.
9. Electromagnetic radiation (or
radiation) – The
transfer of energy (heat) through space by electromagnetic waves.
10. Eyepiece – A
short-focal-length lens used to enlarge the image in a telescope. The lens nearest the eye.
11. Focal length – The
distance from the lens to the point where it focuses parallel rays of light.
12. Focus (light) – The
point where a lens or mirror causes light rays to converge.
13. Granules – The fine
structure visible on the solar surface caused by the convection cells below.
14. Nuclear Fusion – A
type of nuclear reaction which consists of several small nuclei reacting to
form a larger nucleus. This is the source of the sun’s energy.
15. Objective lens – The
collecting lens of a refracting telescope.
16. Photon – A discrete
amount (quantum) if electromagnetic energy
17. Photosphere – The
region of the Sun that radiates energy to space. The visible
surface of the sun.
18. Prominence – A concentration of
material above the solar surface that appears as a bright archlike
structure
19. Proton-proton chain –
A chain of thermonuclear reactions by which nuclei of hydrogen are built up
into nuclei of helium.
20. Radiation pressure –
The force exerted by electromagnetic radiation from an object such as the Sun.
21. Radio interferometer
– Two or more radio telescopes that combine their signals to achieve the
resolving power of a larger telescope
22. Radio telescope – A
telescope designed to make observations in radio wavelengths.
23. Reflecting telescope
– A telescope that concentrates light from distant objects by using a concave
mirror.
24. Refracting telescope
– A telescope that employs a lens to bend and concentrate the light from
distant objects.
25. Solar flare – A
sudden and teremendous eruption in the solar chromosphere.
26. Solar wind –
Subatomic particles ejected at high speed from the solar corona.
27. Spectroscope – A instrument for directly viewing the spectrum of light
source.
28. Spectroscopy – The study of
spectra
29. Spicule
– A narrow jet of rising material in the solar chromosphere.
30. Sunspot – A dark spot on the Sun, which is cool by contrast to the
surrounding photosphere.
Chapter 23 Light, Astronomical Observations, and The Sun Word List:
|
Bright-line
spectrum (emission spectrum) Chromatic
Aberration Chromosphere Continuous spectrum
Dark-line spectrum (absorption) Doppler effect Electromagnetic
radiation |
Eyepiece Focal length Focus Granules Nuclear fusion Objective lens Photon Photosphere Prominence Proton-proton chain
Radiation pressure |
Radio
interferometer Radio telescope Reflecting
telescope Refracting
telescope Solar flare Solar wind Spectroscope Spectroscopy Spicule Sunspot |