# Chapter 5

### Description

Astronomy
Quiz by Ryan Tram, updated more than 1 year ago
 Created by Ryan Tram about 7 years ago
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## Resource summary

### Question 1

Question
How can the density of the Sun be measured?
• by using the density of hydrogen as measured on Earth
• by analyzing samples of the solar wind
• by using the amount of area covered by Venus during a transit
• by using Newton’s laws and the Sun’s diameter

### Question 2

Question
What is the definition of Absolute Zero?
• zero degrees Celsius
• the temperature at which no thermal energy can be extracted from atoms
• the temperature at which water freezes
• the temperature at which molecules split into atoms

### Question 3

Question
The temperature of an object is 273K. What is the temperature in degrees Celsius?
• 273
• -273
• 0
• 373

### Question 4

Question
The temperature of an object is 373K. What is the temperature in degrees Celsius?
• -273
• -173
• 173
• 273

### Question 5

Question
What is the temperature of an object from which no heat energy can be extracted?
• 0 Kelvin
• 100 Kelvin
• 100 Celsius
• Celsius

### Question 6

Question
The surface temperature of the Sun is about 5800K. Based on this temperature, what is the expected peak wavelength of radiation?
• orange
• green
• yellow
• red

### Question 7

Question
Which of the following measures the average speed of the particles (atoms or molecules) in a gas?
• Heat
• Composition
• Temperature
• Binding energy

### Question 8

Question
A plot of the continuous spectra of four different stars is shown in the figure. Based on these spectra, which of the stars is the hottest?
• A
• B
• C
• D

### Question 9

Question
A plot of the continuous spectra of four different stars is shown in the figure. Based on these spectra, which of the stars has the lowest temperature?
• A
• B
• C
• D

### Question 10

Question
The Sun emits its maximum intensity of light at about 520 nm. According to Wien’s Law, at what wavelength would the maximum intensity be for a star with a surface temperature twice that of the Sun?
• 260 nm
• 1040 nm
• 5800 nm
• 11600 nm

### Question 11

Question
What is the sequence of star colours in order of increasing temperature?
• red, yellow, blue
• red, blue, yellow
• yellow, blue, red
• blue, yellow, red

### Question 12

Question
Is it possible for a red star to emit more energy than a blue star?
• No, because the red star has a lower temperature.
• Yes, if the red star has a larger area.
• Yes, if the red star has a larger wavelength of maximum intensity.
• No, because red stars are less massive than blue stars.

### Question 13

Question
The Stefan-Boltzmann law says that hot objects emit energy proportional to the fourth power of their temperature. One star has a temperature of 30,000 K and another star has a temperature of 6,000 K. Compared to the cooler star, how much more energy per second will the hotter star radiate from each square meter of its surface? (Please see appendix)
• 5 times
• 25 times
• 625 times
• 10^15 times

### Question 14

Question
What is the explanation for the pattern of granulation seen on the visible surface of the Sun?
• The granules form the base of a circulation pattern that extends from the photosphere to the outer corona.
• The granules are regions of nuclear energy generation in the Sun
• Each granule contains a strong magnetic field, which compresses and heats the gas underneath it.
• The granules are the tops of hot gases that have risen from the Sun's convective Zone

### Question 15

Question
What is found in the centers of granules?
• hot material rising to the photosphere from below
• cool material falling from the photosphere to the regions below
• material that is fainter and hotter than its surroundings
• material that is brighter and cooler than its surroundings

### Question 16

Question
What is responsible for binding the electrons to the nucleus?
• Kirchhoff's law
• Wien’s law
• Coulomb's Law
• Balmer series

### Question 17

Question
Which of the following is a set of rules that describes how atoms and subatomic particles behave?
• Kirchhoff's law
• Wien’s law
• Quantum Mechanics
• General Relativity

### Question 18

Question
What is the lowest energy level in an atom called?
• Ground State
• The absolute zero temperature
• The ionization level
• The energy level from which the Paschen series of hydrogen originates

### Question 19

Question
The energy of the first level in an atom is 2.2×10-18 J, and the energy of the second energy level is 1.6×10-18 J. What is the energy of the photon that is emitted if an electron moves from the second level to the first?
• 3.5×10^-36 J
• 6.0×10^-19 J
• 3.5×10^-18 J
• 6.0×10^-18 J

### Question 20

Question
The diagram illustrates a light source, a gas cloud, and three different lines of sight (the observer is located at the numbered positions). Along which line of sight would an observer see an absorption spectrum
• 1
• 2
• 3

### Question 21

Question
Which of the following can be determined from the spectrum of a star, without additional information?
• core temperature
• distance
• velocity across the sky

### Question 22

Question
Which of the following is a property of the Sun’s chromosphere?
• produces a coronal filtergram
• is below the visible surface of the Sun
• is above the corona
• hotter than the photosphere

### Question 23

Question
A boy has mass equal to 35 kg on the surface of the Earth? What is his weight on the surface of the sun?
• 2678 N
• 350 N
• 1589 N
• 9620.8 N

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