Why are Balmer lines strong in the spectra of medium-temperature stars and weak in the spectra of hot and cool stars?
Q: A star is known to be moving at 7.87km/s toward the earth. If you observe the spectral line to be at…
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Q: Why are metals less abundant in older stars than in younger stars?
A: Answer: The metals which basically are non hydrogen and helium material are produced or created in…
Q: How would two stars of equal luminosity—one blue and the other red—appear in an image taken through…
A: The two stars have equal luminosity, so their fluxes received on the earth would be the same. In the…
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: Two stars of the same diameter or observed to have surface temperatures of 4000 Kelvin and 16,000…
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Q: What property of a star had a greater effect on the amount of light emitted—its temperature or its…
A: A very small increase in the temperature of star can significantly increase the energy emitted per…
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: What are the approximate spectral type, temperature, absolute magnitude number, and luminosity of…
A: Required : Spectral type, absolute magnitude, temperature and luminosity of star E.
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: Hertzsprung-Russell Diagram
A: In the sky, there are many groups of stars. Some of them are small. while some of them are large.…
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: Consider two stars, A and B, of equal size. You take a spectrum of each star and find that the flux…
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Q: What characterizes a star of spectral-type A in the visible part of the spectrum? Strong lines…
A: Spectral type A has wavelength ranging from 290-390 nm. They have very strong hydrogen lines.
Q: The percentage of helium used immediately during a star’s helium flash phase is
A: It is a very brief phase
Q: If a star is moving rapidly towards us, how does the doppler shift affect its spectrum? Is it…
A: Given, A star is moving rapidly towards us, there will be doppler shift in the spectrum.
Q: Why massive stars are short lived?
A: A massive star has a shorter life spanthan an average star because of fasterhydrogen fuel…
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: If the hottest star in the Carina Nebula has a surface temperature of 51,000 K, at what wavelength…
A: Concept: "The Wien's displacement law states that the wavelength carrying maximum energy is…
Q: Why do distant stars look redder than their spectral types suggest?
A: The pace is mostly empty but there are areas of large density of the interstellar medium. It…
Q: What characteristics must a binary star have to be a good candidate for a black hole? Why is each of…
A: The characteristic must a binary star posses for it to be a good candidate for black hole is, From…
Q: Using Wien's law, what is the wavelength (in nanometers) of the peak of the spectrum of a star which…
A: Solution:-Given thatSurface Temperature (Ts)=2.9×104 K
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: Why do metal-poor stars have a wider range of orbital shapes than metal-rich stars like the sun?
A: Stars are classified into two categories. Population I and Population II. Population I stars are…
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: Imagine that you are observing a star and you find the wavelength of peak emission for the star to…
A: required:)wavelength of peak emission for a new star having temperature one third of original star.
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: The above spectrum is most plausibly produced by which kind of object? Select one alternative:
A: Required : Correct choice.
Q: Consider the following question: How many times bigger than the sun would a cool star (4000K) have…
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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: 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 stars tend to form in groups?
A: Space is filled with an interstellar medium that consists of gas and dust particles. The density…
Step by step
Solved in 3 steps
- Integrate the first equation over all wavelengths to find an expression for the total luminosity of a black body star. (See the second equation for a hint)The three most prominent spectral lines of hydrogen are H-α at 656 nm, H-β at 486 nm, and H-γ 434 nm. If we observe an object with H-α at a wavelength of 700 nm, what wavelength will we observe H-β and H-γ? Is the object moving toward or away from us, and how do you know? Suppose we observe another object with H-α at 585 nm. Is this object moving toward or away from us? Is it moving slower or faster than the first object?At rest hydrogen has a spectral line at 149nm. If this line is observed at 144 nm for the star proxima how fast is proxima moving in km/s