Astro 1 Exam 3 2024/2025 Exam
Questions with Detailed Verified
Answers (100% Correct Answers) |
Already Graded A+
what is the sun comprised of? - 🧠ANSWER ✔✔73% hydrogen 25% helium
why is the sun stable? - 🧠ANSWER ✔✔outward force of gas pressure;
inward force of gravity
Where does the gas pressure in the sun come from? - 🧠ANSWER
✔✔nuclear fusion reactions in the core at temperatures of 15 million
degrees
What is the diameter of the sun compared to earth? mass? luminosity
(compared to 100W lightbulbs? - 🧠ANSWER ✔✔diameter-109x; mass-
333,000; luminosity- 4 x 10^24
What percent of mass in the solar system comes from the sun? -
🧠ANSWER ✔✔99.9%
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,how long has the sun been shining? how much longer will it shine? -
🧠ANSWER ✔✔4.5 billion years; 5.5 billion years
what are sunspots? - 🧠ANSWER ✔✔slightly cooler regions on the sun's
surface
what causes sunspots? how long are their cycles? - 🧠ANSWER
✔✔magnetic activity preventing hot material from rising to that region. they
have 11 year cycles
what comprises helium-4? What does it release? What is it called? -
🧠ANSWER ✔✔4 protons combine to make helium-4 (2 protons, 2
neutrons); produces gamma rays; it is called the proton-proton chain
What is the first step in Nuclear fusion? - 🧠ANSWER ✔✔two protons stick
together and one changes into a neutron to produce deuterium (1 proton
and 1 neutron)
What is the second step in Nuclear fusion? - 🧠ANSWER ✔✔deuterium plus
proton makes helium-3 (2 protons and 1 neutron bound together)
What is the third step in nuclear fusion? - 🧠ANSWER ✔✔two helium-3
molecules combine to make helium-4 and 2 protons
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, When is energy created in Nuclear fusion? - 🧠ANSWER ✔✔in every step
Where does the energy in Nuclear fusion come from? - 🧠ANSWER ✔✔E=
mc^2 because the mass of helium is 4 less than the mass of 4 protons
What are the layers of the sun from inside to out? - 🧠ANSWER ✔✔core,
radiative zone, connective zone, photosphere, chromosphere, flare,
prominence, corona, solar wind
What is the core of the sun like? - 🧠ANSWER ✔✔at center; high density
and temperature; where nuclear reactions occur and gamma rays produced
What is the radiative zone of the sun like? - 🧠ANSWER ✔✔photons are
repeatedly reabsorbed
and emitted, and the energy of an individual photon
can take on average 170,000 years to pass through
What is the connective zone of the sun like? - 🧠ANSWER ✔✔hot gas rises
and cold gas sinks;
light traverses in 1 week
What is the photosphere of the sun like? - 🧠ANSWER ✔✔temperature
5780K; the surface that we see; photons have been converted to visible
COPYRIGHT©PROFFKERRYMARTIN 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
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PRIVACY STATEMENT. ALL RIGHTS RESERVED
Questions with Detailed Verified
Answers (100% Correct Answers) |
Already Graded A+
what is the sun comprised of? - 🧠ANSWER ✔✔73% hydrogen 25% helium
why is the sun stable? - 🧠ANSWER ✔✔outward force of gas pressure;
inward force of gravity
Where does the gas pressure in the sun come from? - 🧠ANSWER
✔✔nuclear fusion reactions in the core at temperatures of 15 million
degrees
What is the diameter of the sun compared to earth? mass? luminosity
(compared to 100W lightbulbs? - 🧠ANSWER ✔✔diameter-109x; mass-
333,000; luminosity- 4 x 10^24
What percent of mass in the solar system comes from the sun? -
🧠ANSWER ✔✔99.9%
COPYRIGHT©PROFFKERRYMARTIN 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
1
PRIVACY STATEMENT. ALL RIGHTS RESERVED
,how long has the sun been shining? how much longer will it shine? -
🧠ANSWER ✔✔4.5 billion years; 5.5 billion years
what are sunspots? - 🧠ANSWER ✔✔slightly cooler regions on the sun's
surface
what causes sunspots? how long are their cycles? - 🧠ANSWER
✔✔magnetic activity preventing hot material from rising to that region. they
have 11 year cycles
what comprises helium-4? What does it release? What is it called? -
🧠ANSWER ✔✔4 protons combine to make helium-4 (2 protons, 2
neutrons); produces gamma rays; it is called the proton-proton chain
What is the first step in Nuclear fusion? - 🧠ANSWER ✔✔two protons stick
together and one changes into a neutron to produce deuterium (1 proton
and 1 neutron)
What is the second step in Nuclear fusion? - 🧠ANSWER ✔✔deuterium plus
proton makes helium-3 (2 protons and 1 neutron bound together)
What is the third step in nuclear fusion? - 🧠ANSWER ✔✔two helium-3
molecules combine to make helium-4 and 2 protons
COPYRIGHT©PROFFKERRYMARTIN 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
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PRIVACY STATEMENT. ALL RIGHTS RESERVED
, When is energy created in Nuclear fusion? - 🧠ANSWER ✔✔in every step
Where does the energy in Nuclear fusion come from? - 🧠ANSWER ✔✔E=
mc^2 because the mass of helium is 4 less than the mass of 4 protons
What are the layers of the sun from inside to out? - 🧠ANSWER ✔✔core,
radiative zone, connective zone, photosphere, chromosphere, flare,
prominence, corona, solar wind
What is the core of the sun like? - 🧠ANSWER ✔✔at center; high density
and temperature; where nuclear reactions occur and gamma rays produced
What is the radiative zone of the sun like? - 🧠ANSWER ✔✔photons are
repeatedly reabsorbed
and emitted, and the energy of an individual photon
can take on average 170,000 years to pass through
What is the connective zone of the sun like? - 🧠ANSWER ✔✔hot gas rises
and cold gas sinks;
light traverses in 1 week
What is the photosphere of the sun like? - 🧠ANSWER ✔✔temperature
5780K; the surface that we see; photons have been converted to visible
COPYRIGHT©PROFFKERRYMARTIN 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
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PRIVACY STATEMENT. ALL RIGHTS RESERVED
