If neutron stars are hot, why aren't they very luminous?
Q: Many of the bright stars in the night sky are highly luminous normal blue stars (such as Acrux), and…
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Q: erstanding the Mass- Luminosity Relation How do we make sense of stellar lifetimes? Mo t(yr) 0.08 1…
A: The lifetime of a star is determined by its mass and its rate of energy production through nuclear…
Q: The surface of a star usually has the highest temperature O True O False
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Q: The expanding bubble of hot gas shown in the figure, which has been inflated by the light from a…
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Q: Which stars are associated with a planetary nebula? black holes, neutron star's, white dwarf or main…
A: Required : What are planetary nebula associated with.
Q: where do hydrogen-buring stars spend most of their time on the H-R Diagram? Is it the main sequence,…
A: Hydrogen burning stars are those stars which burns hydrogen as their dominant fuel. Horizontal…
Q: How does the presence of degenerate matter in a star trigger the helium flash?
A: As per the Pauli Exclusion Principle not more than two electrons inside an atom can have the same…
Q: If a neutron star has a radius of 9.12 km and a temperature of 3.63 x 106 K, how luminous is it in…
A: 1)Using stefan's lawP = σ A T4Where P is the power σ is the stefan's constant A is the area of…
Q: To find the Sun’s luminosity from its brightness using the inverse-square law, you also had to be…
A: The distance to the sun can be calculated using the method of parallax. Parallax is defined as the…
Q: A star is found with a luminosity 2*104 greater than the sun and a photosphere (`surface’)…
A: We have to consider two given facts 1: the star is much luminous than our star 2: the star has a low…
Q: At rest, hydrogen has a spectral line at 144 nm. If this line is observed at 168 nm for the star…
A: Given that Hydrogen has a spectral line at λ= 144 nm =10-9m This line is observed at λ'= 168 nm=10-9…
Q: from the Sun (luminosity = 4x1026 Watts) before it appeared as bright as a 100-Watt light bulb…
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Q: Why massive stars are short lived?
A: A massive star has a shorter life spanthan an average star because of fasterhydrogen fuel…
Q: f a star is to eventually form a stellar black hole at any point in its life cycle, what must…
A: a star spends most of its lifetime as a main-sequence star. when it consumes all of its hydrogen…
Q: Calculate the surface temperature of the star Betelgeuse whose λmax is 850 nm
A: Wien's Law of Blackbody Radiation λmaxT = a constant = 3 × 106 where λmax = wavelength of radiation…
Q: Mention a method to measure temperature of a star.
A: Temperature of the stars cannot be measured directly as they are very far.
Q: If the Sun is well approximated by a black body with a temperature of 6,000◦ K, then how does its…
A: By using Stefan Boltzmann's Law
Q: At what wavelengths do stars of surface temperates 20 000 K, 10 000 K, and 3000 K have their peak…
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Q: If the surface Temperature of a star was about 11000.0 K instead of 7000.0 K what is the ratio of…
A: Given , temperature of the star is 11000 K instead of 7000 K How many times greater is the magnitude…
Q: The red supergiant star Betelgeuse has an absolute magnitude of -5.85. If the Sun has an absolute…
A: Luminosity is nothing but intrinsic property. This is the brightness of star which it possesses and…
Q: Assume that you observe both of these stars in a galaxy 10 million light-years away. How bright is…
A: 1) Distance of both stats from observer, d = 10 million light years d = 10 x 106 ly d = 107 ly 1…
Q: Suppose that a neutron star has a radius of 10 km and a temperature of 1,000,000 K. How luminous is…
A: The luminosity of a star is defined as the total amount of electromagnetic energy released by a star…
Q: Pulsating variable stars are normal stars experiencing brief period instability lasting only a few…
A: A variable star is a star whose brightness as seen from Earth (its apparent magnitude) fluctuates.
Q: Iron is unique among the elements in terms of its nuclear properties, and this gives it a decisive…
A: Explanation: Iron is not the heaviest element that stars can produce, just the heaviest one that can…
Q: and is 10^16m distant from us, what would we measure its brightness to be? If we then moved that…
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Q: Why don't red dwarfs become giant stars?
A: Red dwarf stars or M-type stars are small stars with a mass of 0.08 to 0.6 times the mass of the…
Q: Calculate the surface temperature of the star (in K), if the radius of the star is 9,7x10 m and the…
A: Given values: Radius of the star, R=97×108 mMass lost by the star per second, m=54×1010 kg
Q: Many of the bright stars in the night sky are highly luminous normal blue stars (such as Acrux), and…
A: Given: The distance between the bright star and the earth is r = 620 light years The luminosity of…
Q: Find the wavelength of peak intensity for a hot 45000 K star that emits thermal radiation.
A: Given information:Temperature of the object (T) = 45000 K
Q: If a T Tauri star is the same temperature as the sun but is ten times more luminous, what is its…
A: The energy radiated by a star per second is known as its luminosity and is directly proportional to…
Q: Why is it, that a star which uses up the hydrogen in its core, swells to enormous size and changes…
A: Required : Why does a star which uses up the hydrogen swells to enormous size and changes color.
Q: Why did astronomers conclude that pulsars actually could not be pulsating stars?
A: Pulsars are defined as highly magnetized rotating neutron stars. They are capable of releasing beams…
Q: We will take a moment to compare how brightly a white dwarf star shines compared to a red giant…
A: The luminosity () of a star is related to its surface temperature () and radius () through the…
Q: Why are Balmer lines strong in the spectra of medium-temperature stars and weak in the spectra of…
A: Spectral lines are formed when electrons inside an atom make a transition between energy levels.…
Q: What are the on the axes of a Hertzsprung-Russell diagram? (b) Name one thing you can tell about a…
A: Hertzsprung-Russell Diagram plots the temperature of the start against their luminosity (or) colour…
Q: Why do old stars have less metal compared to new ones?
A: As per the Big Bang theory, the universe expanded from an initial high-density state. In the…
Q: Explain why massive stars evolve faster?
A: Stars are formed in the interstellar medium. The interstellar medium contains hydrogen and helium…
Q: If the gravitational attraction is important in a neutron star where the neutrons are close…
A: Here, we look at the reason why gravitational force is strong in a neutron star but not in a…
Q: Chart the evolutionary process of a high mass star on the H–R diagram from ZAMS to death.
A: Required to draw: The evolution of high mass stars from Zero Age Main Sequence (ZAMS) to Death: We…
Q: does the H-R diagram show? Explain the main sequence of stars.
A: The H-R diagram is Hertzsprung- Russell Diagram, it is a graph in which absolute magnitude of stars…
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