Why does hydrogen, which is abundant in the sun's atmosphere, have relatively weak spectral lines, while calcium, which is not abundant, has very strong spectral lines?
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: 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: Hertzsprung-Russell Diagram Blue or blue white White Yellow Red orange Red Superglants beleignne…
A: In this problem, it is asking about the brightest star.
Q: 13) Calculate the luminosity in watts from the absolute magnitude for the given stars: (a) Sun (M =…
A: Luminosity can be defined as an absolute measure of radiated power emitted by a light source over…
Q: If a star has a radius 2 times larger than the Sun's and a luminosity 1/4th that of the Sun, how…
A: Given that Radius of star, R = 2 luminosity of the star ,
Q: Why is the sun orange?
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Q: Suppose a star has the same luminosity as our Sun (3.8x1026watts3.8x1026watts) but is located at a…
A: as per our guidelines, we can answer only first question. please resubmit rest questions for…
Q: Two stars of the same diameter or observed to have surface temperatures of 4000 Kelvin and 16,000…
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Q: Which spectral line does this likely correspond to?
A: we can use the doppler shift formula to find laboratory wavelength.
Q: Hertzsprung-Russell Diagram Blue or blue w White Vellow Red orange Red Rioe Supergl Beteigeuse Main…
A: The region of main sequence contains large number of stars than any other region. Therefore most of…
Q: The sun is the only star whose size we can easily measure directly; astronomers therefore estimate…
A: Given, Photon Energy =2.4eVWe know the term Luminosity, The term, Luminosity is an absolute measure…
Q: Which two spectral types were added to the spectral sequence after 1998? a. O and B b. K and M…
A: We define "Spectra of a star" as the elements absorbed by them. So based on the spectral…
Q: Hertzsprung-Russell Diagram Bhe or bhue white White Vellow Red orange Red ORigel Superglants…
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Q: object (A and B), state if it is a star
A: This concept is related to blackbody radiations.
Q: At the surface of the sun, the temperature is approximately 5800 K. What fraction of the energy is…
A: (a) The total energy U of the electromagnetic radiation is given by following expression. Here, h…
Q: Calculate the total amount of radiative energy per second intercepted by Mars from the Sun using the…
A: Given data: Flux of radiation, Φ=597 W/m2 Luminosity of Sun, Ls=3.8×1026W Distance, D=2.25×1011m
Q: Explain how hydrostatic equilibrium and the star's internal structure are linked.
A: It is to be explained that how the hydrostatic equilibrium and the star's internal structure are…
Q: at what wavelength (in nm) will it radiate the most energy? Is this a cool or hot star?
A: According to Wien's displacement law The peak wavelength relation is given as Peak wavelength =…
Q: Why does the spectrum of most stars (including the Sun) show absorption lines in which light is…
A: Solution: Given: Why does the spectrum of most stars (including the Sun) show absorption lines in…
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: Suppose a star has a luminosity of 7.0x1026 watts and an apparent brightness of 4.0×10-12 watt/m?.…
A: Luminosity of star (L) = 7×1026 watt Apparent brightness (AB) = 4×10-12 Wm2
Q: Using the proportionality relationships for stellar luminosity as a function of mass and stellar…
A: Stellar lifetime is directly proportional to Stellar mass. Stellar luminosity is inversely…
Q: How does the temperature of the peak (maximum) wavelength of 41 Cygni (at baseline level) compare…
A: Answer: The temperature of the peak (maximum) wavelength of 41 Cygni (at baseline level) by…
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: From the HR diagram above, we could determine that the star Barnard's Star has a temperature 3.03E+3…
A: Solution: The luminosity of state is given by the following formula, L=4πR2σT4…
Q: L = ( 0.0813 ) x (Rs) ^2 x 10-0.4m x Ls where L = luminosity of the desired star Rs = distance of…
A: Given: Luminosity of Sun, Ls=1.00 Distance of the Polaris' star,Rs=323 light years Apparent magniude…
Q: Star A has an apparent magnitude of –1.5 and is 12.6 light-years from Earth. Star B has an apparent…
A: Given: dA=12.6ly=3.863parsec, dB=15.6ly=4.783parsec, mvA=-1.5, mvB=0.4 The apparent magnitude of a…
Q: Which material emits a continuous spectrum? Question 2 options: red hot iron…
A: A continuous spectrum is a spectrum that shows no interruptions across its entire range. In other…
Q: The Three primary colors of light are: ____ ____ ___ _____ ____ ___ 6. (7) How are…
A: White light consists of all possible light colors or wavelengths. This means by mixing a sufficient…
Q: Besides using the peak wavelength emitted in its blackbody curve, how can a star’s spectrum tell you…
A: Introduction: A blackbody is a theoretical or model body that absorbs all radiation falling on it,…
Q: if gas cloud in the image crosses in front of the star, and the gas cloud and star have different…
A: A gas cloud has a lot of hydrogen in it, which abosrbs the UV light emitted by a star. When UV light…
Q: Hertzsprung-Russell Diagram Blue or blue-white White Yellow Red-orange Red O Rigel Supergiants…
A: Option a is the right answer Red color of the stars have lowest surface temperature
Q: A star has a surface area of 6.92x1018 m2. How much power does it radiate if it has a surface…
A: (given) Surface area (A) of star = 6.92 x 1018 m2 Surface temperature (T) = 6,017 K σ is the…
Q: Star A has a temperature of 5,000 K and Star B has temperature of 6,000 K. At what wavelengths (in…
A: Temperature of star A = 5000 k temperature of star B = 6000 k
Q: subject: astronomy) 1. When do you say a star is very hot compared to the red. 2. are stars of equal…
A: Answer (1) A blue star will always be hotter than the red star. It is independent of the relative…
Q: What is the color of the stars shown on the diagram that have the lowest surface temperature? O red…
A: Required: Color of the stars,
Q: A star has a luminosity (power output) of 9.2x1026 W and a diameter of 6.1x108 m. What is its…
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Q: Two stars have the same diameter and are at the same distance from us (but in different parts of the…
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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: Temperature (C) What is the color of the stars shown on the diagram that have the highest surface…
A: SOlution: To find the highest temeprature region in the graph
Q: The white dwarf star Sirius B has a luminosity of 0.025 L⊙. If you were 1 AU from Sirius B, would…
A: Given,Temperature, Apparent magnitude of the sun, The luminosity of the star sirius B, The…
Q: Imagine that you are an astronomer studying a star 4 parsecs away (a parsec is 3.09x1016 m). You…
A: Given that Distance of star from the telescope d = 4 parsecs. 1parsecs=3.09×1016m Incoming flux…
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…
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