# General Information On The Astronomy Quiz 15

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Quizzes Created: 5 | Total Attempts: 696
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The quick quiz below is the fifteenth one is a series of tests aimed at testing your general understanding on astronomy. It is very interesting and covers a lot of the aspects about the universe you have learnt in various classes. Give it a shot and all the best of luck!

• 1.

### Information comes to us from the Sun in the form of:

• A.

Infrared waves

• B.

Visible (light) waves

• C.

Ultraviolet waves

• D.

All of the above

• E.

None of the above

D. All of the above
Explanation
The Sun emits various forms of electromagnetic radiation, including infrared waves, visible (light) waves, and ultraviolet waves. These waves carry information from the Sun to us. Therefore, the correct answer is "all of the above" as all three types of waves are involved in the transmission of information from the Sun.

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• 2.

### Light waves are most often labeled using their:

• A.

Amplitude

• B.

Power

• C.

Wavelength and/or frequency

• D.

All of the above

• E.

None of the above

C. Wavelength and/or frequency
Explanation
Light waves are most often labeled using their wavelength and/or frequency because these two properties are fundamental characteristics of a wave. The wavelength refers to the distance between two consecutive peaks or troughs of the wave, while the frequency represents the number of complete cycles of the wave that occur in one second. Both wavelength and frequency are used to describe and differentiate different types of light waves, such as visible light, infrared, ultraviolet, etc. Therefore, the correct answer is wavelength and/or frequency.

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• 3.

### The wavelength and the frequency of a wave are related by:

• A.

The color of light

• B.

The speed of light

• C.

The light power

• D.

All of the above

• E.

None of the above

B. The speed of light
Explanation
The wavelength and frequency of a wave are related by the speed of light. This relationship is described by the equation c = Î»Î½, where c is the speed of light, Î» is the wavelength, and Î½ is the frequency. This equation shows that as the wavelength of a wave decreases, its frequency increases, and vice versa. The speed of light is a fundamental property of electromagnetic waves and is constant in a vacuum. Therefore, it is the correct answer to the question.

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• 4.

### The speed of light, "c", is:

• A.

A constant only within our solar system

• B.

A constant only within our galaxy

• C.

A constant everywhere in our universe

• D.

Not constant at all, it depends on the frequency of the light

• E.

None of the above

C. A constant everywhere in our universe
Explanation
The speed of light, "c", is a constant everywhere in our universe. This is a fundamental principle of physics, known as the speed of light in a vacuum. It is independent of the location or context within the universe. The value of the speed of light is approximately 299,792,458 meters per second, and it remains the same regardless of the frequency or wavelength of the light. This constant speed of light plays a crucial role in many scientific theories and has been experimentally verified numerous times.

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• 5.

### The temperature of the Sun can be determined if we measure the solar spectrum(light intensity vs wavelength) and we compared it to:

• A.

Einstein's theory of special relativity

• B.

Kepler's laws

• C.

The spectral distribution for "black bodies"

• D.

The spectral distribution for "white hot bodies"

• E.

None of the above

C. The spectral distribution for "black bodies"
Explanation
The temperature of the Sun can be determined by comparing its solar spectrum to the spectral distribution for "black bodies." Black bodies are theoretical objects that absorb all radiation that falls on them and emit radiation according to their temperature. The spectral distribution for black bodies follows a specific pattern based on temperature, known as Planck's law. By comparing the solar spectrum to this distribution, we can determine the temperature of the Sun. The other options, Einstein's theory of special relativity and Kepler's laws, are not relevant to determining the temperature of the Sun.

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• 6.

### The mass of the Sun can be determined once we know:

• A.

Newton's laws of gravitational motion

• B.

Kepler's laws

• C.

The actual radar distance between Earth and Venus

• D.

All of the above

• E.

None of the above

D. All of the above
Explanation
The mass of the Sun can be determined once we know all of the above. Newton's laws of gravitational motion provide the fundamental principles for understanding the motion of celestial bodies, including the Sun. Kepler's laws describe the motion of planets around the Sun and provide important information about the Sun's mass. The actual radar distance between Earth and Venus can be used in combination with Kepler's laws and Newton's laws to calculate the mass of the Sun through gravitational calculations. Therefore, all of the given options are necessary to determine the mass of the Sun.

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• 7.

### In addition to the Earth to Sun distance in meters, what is needed to measure the mass of the Sun:

• A.

Just Newton's laws and the distance: so nothing else is needed

• B.

The length of the year in seconds

• C.

The temperature of the Sun

• D.

None of the above

B. The length of the year in seconds
Explanation
To measure the mass of the Sun, in addition to the Earth to Sun distance, the length of the year in seconds is needed. This is because the mass of the Sun can be determined using Kepler's Third Law, which relates the orbital period (the length of the year) of a planet around the Sun to the distance between them. By knowing the Earth to Sun distance and the length of the year, the mass of the Sun can be calculated using Newton's laws of motion. Therefore, the other options (just Newton's laws and the distance, the temperature of the Sun, and none of the above) are incorrect as they do not provide the necessary information to measure the mass of the Sun.

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• 8.

### The "solar constant" is:

• A.

The principle that the energy from the Sun changes only inperceptibly with time

• B.

The intensity of sunlight above the atmosphere of any planet in watts/m^2

• C.

The intensity of sunlight above the atmosphere of the Earth in watts/m^2

• D.

None of the above

C. The intensity of sunlight above the atmosphere of the Earth in watts/m^2
Explanation
The "solar constant" refers to the intensity of sunlight above the Earth's atmosphere in watts/m^2. This constant represents the amount of solar radiation that reaches the Earth's surface per unit area. It is an important parameter in understanding the Earth's energy balance and climate. The solar constant is not related to the principle that the energy from the Sun changes imperceptibly with time, nor is it applicable to other planets.

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• 9.

### Once we know the solar constant and _____ we can determine the luminosity(total energy output per second, in watts) of the Sun.

• A.

The speed of light, c

• B.

The volume of the Sun

• C.

The radius of the Earth's orbit in meters

• D.

All of the above

• E.

None of the above

C. The radius of the Earth's orbit in meters
Explanation
The luminosity of the Sun can be determined by knowing the solar constant, which is the amount of solar energy received per unit area at the outer atmosphere of the Earth. The solar constant is measured in watts per square meter. To calculate the total energy output per second (luminosity) of the Sun, we need to multiply the solar constant by the total area of the sphere with a radius equal to the radius of the Earth's orbit. Hence, the correct answer is the radius of the Earth's orbit in meters.

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• 10.

### Once we know the Sun's luminosity we can determine the intensity of sunlight (in watts/m^2) at Saturn if we know:

• A.

The surface area of the Sun (in m^2)

• B.

The surface area of Saturn (in m^2)

• C.

The radius of the Sun (in meters)

• D.

The radius of Saturn's orbit (in meters)

• E.

None of the above

D. The radius of Saturn's orbit (in meters)
Explanation
The intensity of sunlight at Saturn can be determined by knowing the radius of Saturn's orbit. The intensity of sunlight decreases with distance from the Sun, so the further Saturn is from the Sun, the lower the intensity of sunlight will be. Therefore, the radius of Saturn's orbit is crucial in determining the intensity of sunlight at Saturn. The other given factors, such as the surface area of the Sun, the surface area of Saturn, and the radius of the Sun, are not directly related to determining the intensity of sunlight at Saturn.

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• 11.

### For Astro 101, the standard solar model is a mathematical model of the Sun that gives:

• A.

Fractions of H to He vs radius in the Sun

• B.

Temperature and density vs radius in the Sun

• C.

Differential rotation vs radius in the Sun

• D.

All of the above

• E.

None of the above

B. Temperature and density vs radius in the Sun
Explanation
The standard solar model is a mathematical model that describes the internal structure and properties of the Sun. It provides information about the temperature and density variations with respect to the radius of the Sun. This model helps scientists understand the physical processes occurring within the Sun and how they affect its overall behavior. By studying the temperature and density profiles, researchers can gain insights into the Sun's energy production, nuclear reactions, and other important phenomena.

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• 12.

### The different regions of the Sun are divided by somewhat abrupt changes in:

• A.

Density

• B.

Temperature

• C.

Energy production and/or transport

• D.

All of the above

• E.

None of the above

C. Energy production and/or transport
Explanation
The different regions of the Sun are divided by somewhat abrupt changes in energy production and/or transport. This is because the Sun goes through different processes in different regions to produce and transport energy. These processes can vary in terms of efficiency and mechanism, leading to distinct boundaries between regions. Density and temperature may also change across these boundaries, but they are not the sole factors that divide the different regions of the Sun.

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• 13.

### The atoms of H and He are totally ionized(free nuclei and free electrons) in:

• A.

Only the core

• B.

The core and through most of the radiation zone

• C.

All the way out to the photosphere

• D.

All the way to the start of the corona

• E.

None of the above

B. The core and through most of the radiation zone
Explanation
In the core of the Sun, the temperature and pressure are extremely high, causing the atoms of hydrogen and helium to be completely ionized, meaning that the electrons are stripped away from the nuclei. This results in the presence of free nuclei and free electrons. The ionization process continues through most of the radiation zone, where the energy generated in the core is transported to the surface of the Sun. Therefore, the correct answer is "the core and through most of the radiation zone."

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• 14.

### Energy transport between the outside of the radiation zone to the photosphere is via:

• A.

Conduction

• B.

• C.

Convection

• D.

None of the above

C. Convection
Explanation
Energy transport between the outside of the radiation zone to the photosphere is via convection. Convection is the transfer of heat energy through the movement of fluid or gas. In the outer layers of the Sun, the energy generated in the radiation zone is transported to the photosphere through the process of convection. This occurs as hot plasma rises to the surface, carrying energy with it, while cooler plasma sinks back down. Convection is an important mechanism for energy transfer in stars and plays a crucial role in maintaining their stability and structure.

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• Current Version
• Mar 22, 2023
Quiz Edited by
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• Nov 18, 2008
Quiz Created by
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