Study sets, textbooks, questions
Upgrade to remove ads
Terms in this set (10)
Name two ways in which the thermal radiation spectrum of a star with a surface temperature of 8,000 K differ from that of a star with a surface temperature of 4,000 K.
1. Hotter star energy emitted at every wavelength is higher.
2. The peak wavelength of the hotter star is shorter than that of the 4000K one.
Which of the following waves are not electromagnetic?
1. Visible light
2. radio waves
3. sound waves
4. infrared radiation
5. X-rays, microwaves
6. water waves.
Water Waves: Consider Mechanical Waves
Which of the following factors determine the spectral lines that we see in a star's spectrum?
1. The star's interior temperature
2. its rotation rate
3. the chemical composition of its outer layers.
4. the temperature of its
5. the size of the star
6. the mass of the star
The chemical composition of its outer layers
What is the Doppler effect and what can we learn from it in astronomy?
1. The change in wavelength of radiation (light) due to the relative motion between the source and the observer along the line of sight.
2. We learn about the radial (along the line of sight) motions of stars, and other astronomical object.
How can we recognize a rotating astronomical object from the light it emits?
By using a spectroscopy; which uses the light from a distant object to workout the object is made of.
Why are bananas yellow?Because they
a) emit yellow light,
b) absorb yellow light,
c) reflect yellow light.
b) absorb yellow light
In laboratory experiments, the transition from level 2 to level 1 in hydrogen gas at rest has a wavelength of 121.6 nm. Suppose you see this line at a wavelength of 120.5 nm in star A, at 121.2 nm in star B, at 121.9 nm in star C and at 122.9 nm in star D.
a) Which of these stars are coming toward us? And which ones are moving away?
b) Which star is moving fastest relative to us?
a) Star A & B are coming towards us & star C& D are moving away from us.
b) B would be moving fastest to us.
Suppose that the surface temperature of the Sun was 3,000 K instead of 6,000 K.
a) How much less thermal radiation would the Sun emit?
b) What would happen to the Sun's peak emission wavelength?
a) 16 times less
b) The maximum wavelength intensity is 2 times intensity at 6,000K
Through a telescope, the Orion nebula looks like a glowing cloud of gas. What type of spectrum would you expect to see from the glowing parts of the nebula?
a) An emission spectrum
b) a thermal radiation spectrum
c) an absorption spectrum.
a) An emission spectrum
The most common isoptope of gold has atomic number 79 and atomic mass number 197.
a) How many protons and neutrons does a gold nucleus contain?
b) If a gold atom is neutral, how many electrons does it contain?
c) If a gold atom is triply ionized, how many electrons does it contain?
a) 79 protons & 118 neutrons
b) 79 Electrons
c) missing 3 electrons, only leaving it with 76 electrons
Sets found in the same folder
Sets with similar terms
ASTR 1102 C
ASTR HW 5
Mastering Astronomy - HW4 (Ch. 5 and 7)
ASTR 101 Exam II - HW 5
Other sets by this creator
ch. 7 test questions
SYS ANALYSIS TEST 2
ISQS 4349 TEST 1
Other Quizlet sets
Politics Quiz 1
Final Exam International Relations
Allergies & Hypersensitivity