If a star’s photosphere was at a temperature of 3,000K, what color would it be?

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

A:

Q: Match the definitions to the terms. Blueshift Redshift : When a star is moving toward Earth, the…

A: The redshift and blue shift phenomena are based on the doppler effect of light. The shifting in…

Q: What is the heaviest element likely to be produced in fusion processes in stars?

A: iron is the heaviest element stars can make.

Q: You observe a spectral line from an emission nebula at a wavelength of 723 x 10-9 m.  If you are…

A:

Q: Star 1 emits energy at a rate that is 2 times that of Star 2. If Star 1 also has a radius that is 3…

A:

Q: A star with a radius three times that of the Sun and a surface temperature twice that of the Sun,…

A: 144

Q: If our Sun has a temperature of 6000 K and a luminosity of 1 Solar Luminosity, what is the…

A: Given:

Q: What is the surface temperature of a star that emits light with a wavelength of 400 nanometers?

A:

Q: The luminosity of the Sun is 3.83 × 1026 W. This energy comes from fusion during which some matter…

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Q: The luminosity of Spica is about 5x1030 Joules/second. A mass MH of Hydrogen that undergoes…

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Q: Suppose a star has luminosity 100 times greater than than Sun and a radius 4 times greater than the…

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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 does the process of nuclear fusion reaction have to do with the physical size of a star?

A: One of the most important source of energy for stars is the nuclear fusion reactions. Helium's…

Q: What is the temperature of a star emitting light with a peak wavelength of  7,080 angstroms?  T=…

A: Given : λmax = 7080 angstroms = 7080*10-10 m. From Wien's law the temperature of star is  T =…

Q: The percentage of helium used immediately during a star’s helium flash phase is

A: It is a very brief phase

Q: sequence

A: Hertzsprung-Russell's diagram clearly shows that the star spends most of its life as a main-sequence…

Q: from the Sun (luminosity = 4x1026 Watts) before it appeared as bright as a 100-Watt light bulb…

A:

Q: Why don’t we see hydrogen Balmer lines in the spectra of stars with temperatures of 3,200 K?

A: Balmer series is a spectral emission line of the hydrogen that result electron transition from…

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: Mention a method to measure temperature of a star.

A: Temperature of the stars cannot be measured directly as they are very far.

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: 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: Which star is at higher temperature, a red star or a blue star?

A: The temperature of blue star is 40000 Kelvin degrees.

Q: The luminosity of Spica is about 5x1030 Joules/second. A mass MH of Hydrogen that undergoes…

A:

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: What did you calculate for the radius of the star that had a temperature of 5880 degrees Kelvin and…

A: Given : Temperature=T=5880∘ K Luminosity=L=78 W We have to calculate the value of radius R of the…

Q: Why is it, that a star which uses up the hydrogen in its core, swells to enormous size and changes…

A: Required : Why does a star which uses up the hydrogen swells to enormous size and changes color.

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: What is the element that was mostly produced in both processes (PPCR and CNO cycle) and what is the…

A: In this question we have to answer what is the element that was mostly produced in both processes…

Q: Consider three main sequence stars: Star A is 14,500 K, Star B is 2,900 K, and Star C is 5,500 K.…

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Q: What two forces work against each other to stabilize a star?

A:

Q: Betelgeuse is a nearby supergiant that will eventually explode into a supernova. Let's see how…

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Q: If one star has a temperature of 5600 K and another star has a temperature of 8000 K, how much more…

A: Given data The temperature of one star is given as T1 = 5600 K The temperature of another star is…

Q: Pressure of the Photosphere. The gas pressure of the photosphere changes substantially from its…

A: We know that the ideal gas equation is given as  PV = nkTP = nVkTP = nvkT  where P is the pressure…

Q: Describe how we can estimate the temperature of stars based on their blackbody (thermal) curve.

A:

Q: . If our Sun has a temperature of 6000 K and a luminosity of 1 Solar Luminosity, what is the…

A: A multiple question is given answer for 4 is provided below. Given : Temperature of Sun, Ts = 6000 K…

Q: Given the Sun's present rate of energy generation (i.e. its present luminosity), how long will the…

A: Given: Present luminosity of the sun = 1 L