Our sun, currently a yellow dwarf, will eventually evolve to a red giant star and then to a white dwarf star as shown in the figure. Assume that the sun radiates like a blackbody. Calculate the power radiated by the RED GIANT sun if its surface temperature is 3000 K.

Q: A red giant star might have radius = 104 times the solar radius, and luminosity = 1730 times solar…

A: This problem can be solved using Stefan-Boltzmann law of Black body radiation.

Q: A star has a surface temperature of T = 10,000 K and a radius three times that of the Sun, R = 3R…

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Q: The surface of a star usually has the highest temperature O True O False

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Q: Use the luminosity of the sun, 3.83 x 1026 J/s, the total amount of energy it emits each second, to…

A: Let Ls denote the luminosity of the sun. Let E denote the amount of energy radiated by the Sun in…

Q: If one star has a temperature of 5,000 K and another star has a temperature of 8,500 , how much more…

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Q: This star has a mass of 3.3 MSun. What is the main sequence lifetime of this star? You may assume…

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Q: A newly discovered bright star has a luminosity of 78.4×1026 W. What is its temperature if it has a…

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Q: Star B has a temperature that is 5 times higher than Star A. How much more energy per second…

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Q: Star A has an effective temperature of TA = 7200 K and a radius of RA = 2.04R, asecond star, Star…

A: Let LA be defined as the luminosity of star A and LB be defined as the luminosity of star B. The…

Q: If the Sun expanded to a radius 10 times its current size and its temperature decreased by 55%, how…

A: Given  Radius of sun increased by 10 times Temp decreased buy 55% Tf = 0.45 Ti

Q: What is the approximate temperature of the sun at its chromosphere ?

A: The chromosphere is the third layer of Sun. It ranges from 400 km to 2100 km above the solar…

Q: Our Sun is considered an "average" star. What is the average star really like? Explain. Could you go…

A: We can define an average star as:  An average star, or more properly, an intermediate-mass star,…

Q: The average density of the sun is 1. 4 g/cm3 What do you expect the density to be at 0.25 of Rsun?…

A: Given: The average density of the sun is ρs = 1.4 g/cm3 The radius of the sun is R = 6.9634 x 105 km…

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: Consider a star for which the stellar power per unit area at distance 1 AU from the star is 4.5…

A: Intensity at a distance is Radius of star is Note:The Stefan Boltzmann constant is Find:Surface…

Q: What is the luminosity of a star having three times the radius of the Sun and a surface temperature…

A: The luminosity of a star is a measure of the total amount of energy that is radiated by a star per…

Q: A newly discovered bright star has a luminosity of 78.4×1026 W. What is its temperature if it has a…

A:

Q: If the Sun expanded to a radius 160 times its current size and its temperature decreased by 55%, how…

A: SOlution: Given that Rnew = 160R Tnew = (1-0.55)T Tnew = (0.45)T

Q: Sirius, the brightest star in the sky, is a main sequence star, as is the Sun, but Sirius has a…

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Q: Star A has a temperature of 5,000 K. How much energy per second (in J/s/m2) does it radiate from a…

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Q: Tutorial Star A has a temperature of 6,000 K. How much energy per second (in J/s/m²) does it radiate…

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Q: Suppose the Sun’s main energy source was due to gravitational collapse and assume that the Sun has…

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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: If a star has a surface temperature of 20,000 K (2.00 × 104 K), at what wavelength will it radiate…

A: For calculating the wavelength emitted by a hot body consider it as a blackbody. A blackbody is an…

Q: he energy in the Sun currently is provided by a process that combines two hydrogen atoms to form one…

A: Option C is the right answer  Nuclear fusion.

Q: How would the interior temperature of the Sun be different if the strong force that binds nuclei…

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Q: This star has a mass of 3.3 MSun. What is the main sequence lifetime of this star? You may assume…

A: The main sequence lifetime is given as:t α1M2.5it is given star has mass of 3.3 MSunSo,…

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: If the sun expanded to a radius 5000 times its present radius, what would its average density be (in…

A: The volumetric mean radius of the sun, R⊙=6695,700 km=6.695×106 km=6.695×106 ×105 cm =6.695×1011 cm…

Q: the Sun?

A: Given: To explain the star which is white supergiant star also brightest and hottest than the Sun…

Q: Astronomers use two basis properties of stars to classify them. These two properties are luminosity…

A: Introduction: The Hertzsprung–Russell diagram is a scatter plot of stars showing the relationship…

Q: A main sequence star of mass 25 M⊙has a luminosity of approximately 80,000 L⊙. a. At what rate DOES…

A: Given information: The mass of the star (m) = 25M⊙ The luminosity of the star (L) = 80000L⊙ part a):…

Wien's displacement law

Students often get confused between Wien's displacement law and Planck's radiation law. Although both are historically related, yet they are conceptually different. Planck's law helps determine the spectrum of a blackbody, while Wien's law determines the relationship between peak wavelength and temperature.