If a star has a surface temperature of 20,000 K (2.00 3 104 K), at what wavelength will it radiate the most energy? Is this a cool or hot star
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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…
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- If a star has a surface temperature of 20,000 K (2.00 3 104 K), at what wavelength will it radiate the most energy? Is this a cool or hot star?
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- A main sequence star of mass 25 M⊙has a luminosity of approximately 80,000 L⊙. a. At what rate DOES MASS VANISH as H is fused to He in the star’s core? Note: When we say “mass vanish '' what we really mean is “gets converted into energy and leaves the star as light”. Note: approximate answer: 3.55 E14 kg/s b. At what rate is H converted into He? To do this you need to take into account that for every kg of hydrogen burned, only 0.7% gets converted into energy while the rest turns into helium. Approximate answer = 5E16 kg/s c. Assuming that only the 10% of the star’s mass in the central regions will get hot enough for fusion, calculate the main sequence lifetime of the star. Put your answer in years, and compare it to the lifetime of the Sun. It should be much, much shorter. Approximate answer: 30 million years.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)A certain star has a temperature twice that of the Sun and a luminosity 64 times greater than the solar value. What is its radius, in solar units?
- What is the luminosity of a star having four times the radius of the Sun and a surface temperature of 8,000 K?Studying the spectrum of a star, we see that the Haline (l= 656.285nm) has been shifted to 656.286 nm. Is the star moving towards us or away (explain your answer) How fast is the star moving with respect to us?(Answer don't copy with hand written please)As a star runs out of hydrogen to fuel nuclear fusion in its core, changes within the star usually cause it to leave the main sequence, expanding and cooling as it does so. Would a star with a radius 12 times that of the Sun, but a surface temperature 0.5 times that of the Sun, be more, or less luminous than the Sun? Show and explain your reasoning. You may assume the surface area of a sphere is A = 4πr2.