How is the blue color of a reflection nebula related to the blue color of the daytime sky?
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: What is an emission nebula?
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A: Given, If To is the surface temperature of the sun, Lo is the luminosity of the sun Then for the…
Q: Why is the sun orange?
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Q: The bright star Spica in the constellation Virgo has a surface temperature about 4.4 times that of…
A: Use formula of luminosity and derive a relation for luminosity , radius and temperature of star and…
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: What is the approximate surface temperature of the sun? O 10,000 OC O 5,000 OC O 5,500 OC O 4,000 OC
A: Required : Average surface temperature of the Sun.
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: Why is being able to determine a distance form just an angular measurement important? Also why is…
A: As we know, The angular measurements are the divided circle by the scale of a vernier protractor. It…
Q: What is the most common type of star?
A: There are different types of stars in our universe. They are mainly categorized based on their mass,…
Q: If star B is a 5th magnitude star and star C is 9th magnitude, what is their brightness ratio? Light…
A: Apparent magnitude of the star m is the measure of brightness of star from earth. Brightness is also…
Q: Earth tugs the sun around as it orbits, but it affects the radial velocity of the sun by only 0.09…
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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: 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: 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: Why does hydrogen, which is abundant in the sun's atmosphere, have relatively weak spectral lines,…
A: Atmos has electrons in different energy levels. Spectral lines are formed when electrons make…
Q: In the Sub giant phase which of the following is true? O The star is burning He in the core O The…
A: Given : In the Sub giant phase The star is burning He in the core The star is burning He in a shell…
Q: What causes a star to move off the main sequence?
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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: 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: Star 1 and star 2 have the same V-magnitude, V = 7.5. However, they have different B-magnitudes, B1…
A: Given data : Star 1 and star 2 V-magnitude, V = 7.5 B-magnitudes, B1 = 7.2 and B2 = 8.5 d2 = 10d1 To…
Q: Star A’s luminosity is four times greater than Star B’s. Both stars have the same surface…
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Q: Suppose the distance to a star is doubled. Then the luminosity of the star is O Remains the same,…
A: Luminosity and apparent brightness are 2 different things. Luminosity is unique property of body and…
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: 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: If two stars, star A and star B, have equal luminosities, but star A has half the surface…
A: luminosities of star is proportional to R2T4 T is temperature and R is radius
Q: What measurements would you make (assuming you have the money, time, & equipment) to determine a…
A: In this question we have to answer what measurements we will make to determine the surface…
Q: What is hydrostatic equilibrium in stars.
A: The interstellar medium is mostly made of hydrogen. When the mass of the interstellar medium becomes…
Q: 2. The Crab pulsar radiates at a luminosity of $1 \times 10^{31} \mathrm{~W}$ and has a period of…
A: (a) To determine the rate at which the period is increasing and how long it will take to double:Step…
Q: If our Sun were surrounded by a cloud of gas, would this cloud be an emission nebula? Why or why…
A: Emission nebulae are formed in regions surrounding young stars. When a star is formed in the…
Q: What is the Sun's energy output (luminosity)? Group of answer choices About 4 x 1026 Watts About a…
A: We know that, Sun has radius of 695 x 106 m giving a surface area of 6.09 x 1018 m2 .
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: 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: If star A is five light years away and star B is 10 light years away how much brighter is A than…
A: Given Data Distance of the star A is rA=5 light year Distance of the star B is rB=10 light year We…
Q: The figure below shows the spectra of two stars on the same scale (Star A = red line; Star B = green…
A: According to Hubble's law, velocity of recession of star from our earth is directly proportional to…
Q: Why do two different gasses always have different spectral signatures?
A: Given Why do two different gasses always have different spectral signatures, as following below.
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- In a laboratory, the Balmer-beta spectral line of hydrogen has a wavelength of 486.1 nm. If the line appears in a star's spectrum at 485.8 nm, what is the star's radial velocity (in km/s)? (Enter the magnitude.) km/sHertzsprung-Russell Diagram Blue or blue white White Vellow Red orange Red ORian Superglants Beleigrre Main Sequence Alderaron Glants Alpho Cetaut. E Sirius White 5,000 3,000 10,000 Surface Temperature ("C) 50.000 20.000 6,000 What is the color of the stars shown on the diagram that have the lowest surface temperature? O red O yellow O blue O white Brightness IncreasingStars A and B both have the same spectral class. Star A is 7 times farther away than star B. The brightness of star A will be ________ times dimmer than B. (Give a number.)
- Star 1 and star 2 have the same V-magnitude, V = 7.5. However, they have different B-magnitudes, B1 = 7.2 and B2 = 8.5. What is the flux ratio, f1/f2, in the B-band?1:Which star has been redshifted the most? 2:Which star is moving towards us the fastest? Star C Star D Star A Star B 3:The wavelength of this spectral feature is measured to be 600nm in the lab, and 609 in Star A. What is the radial velocity of Star A? using km/s,What is the wavelength of maximum intensity (in nm) and the total energy emitted (in J/s/m2) by a celestial object at 6 K above absolute zero?
- What evidence can you give that the corona has a very high temperature?Two stars have the same diameter and are at the same distance from us (but in different parts of the sky.) Star A has a temperature of 4000 K, while star B has a temperature of 8000 K. How many times greater is the energy flux of star B compared to star A? (Hint: Use proportional reasoning.)The white dwarf star Sirius B has a luminosity of 0.025 L⊙. If you were 1 AU from Sirius B, would that star appear brighter or fainter than the full Moon appears from Earth? If Sirius B were substituted for the Sun, what would Earth’s average temperature become? (Earth’s current average temperature is T = 287K)