What is the size of a star with a temperature three times as hot as the sun and the luminosity of 100 suns? (L=R^2T^4)

Q: The mass-luminosity relation describes the mathematical relationship between luminosity and mass for…

A: L/Lo = (M/Mo )3.5  here the luminosity is to be found in terms of Lo  M = 4Mo

Q: Pls help ASAP. Pls show all work.

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Q: Put the steps of the life cycle of a star in order.

A: Required :  Steps involved in star cycle.

Q: If the main-sequence mass lower limit is 0.08 solar mass and the brightest main-sequence stars are 1…

A: The Main Sequence Stars are a mass sequence, with low mass stars forming an equilibrium with a cool…

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: Each choice below lists a spectral type and luminosity class for a star. Which one is a hot main…

A: Luminosity of main sequence star is class V and spectral type of hot main sequence star is O.

Q: The red supergiant star in Orion is called Betelgeuse, and its distance is 130 pc. What is the…

A: Parallax is the defined as the apparent shift in the position of any star (or other object) against…

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: A white dwarf star has a visual luminosity of 0.046LSun. If you were 1 AU from the white dwarf, what…

A: Ldwarf = 0.046Lsun Distance d = 1 AU = 1.496×1011 m Lsun = 3.827×1026 W

Q: sequence

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

Q: If the two stars orbit in a such a way that the big star is 4 AU from the center of the mass and the…

A: Given:distance of larger star from COM, ra = 4 AUdistance of smaller star from COM, rb = 12 AUtotal…

Q: Which main-sequence star would be the least luminous?   a. A   b. B   c. F   d. G   e. K

A: Answer:) option(a) A alpha century A is least luminous because its absolute magnitude (+4.4) which…

Q: The mass-luminosity relation describes the mathematical relationship between luminosity and mass for…

A:

Q: Explain the characteristics of Luminosity and the wavelength spectrum of the stars in the following…

A: Stars still more luminous than giants are referred to as supergiant and hyper giants. A hot,…

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: 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: Rank these astronomical objects based on their density, from smallest to largest.   A) the…

A: The given astronomical objects are a) the singularity of a black hole b) a main sequence star c) a…

Q: What is the luminosity of a 5-solar mass main sequence star?

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Q: What the main differences that can occur between the life cycles of a Sun-sized star and a massive…

A: We have to mention the main differences that can occur between the life cycles of a Sun-sized star…

Q: From its spectral type, the surface temperature of a main sequence star is measured to be about…

A: Using the 1r2 rule method, we can find out the star's distance by measuring the intrinsic brightness…

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: The star Firefly is located 3.0 pc away. If it had an absolute magnitude of 13.0, which value below…

A: Write the given data. d=3AbsM=13

Q: The life-cycle path followed by a star is determined by the star’s initial  A. mass and size B.…

A: Star's mass is inversely proportional to its life cycle.

Q: The Sun is a G2 star. Which of the following spectral types is slightly hotter than the Sun? O A. 03…

A: Spectral types Temperature (K) O3 >55,000 K0 5240 A1 9330 F2 7050 M9 <2700

Q: For each statement concerning main sequence stars, select T True, F False, G Greater than, L Less…

A: Required :  True or False, greater, lesser, equal.

Q: A newly discovered star, G78392B is 2.33x1015 km away from earth. How many light years away is star…

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Q: Plaskett's binary system consists of two stars that revolve In a circular orbit about a center of…

A: Given : |v| = 240 km/s = 240 × 103 m/s T = 12.5 days = 1.08 × 106 seconds Msun = 1.99 × 1030 kg

Q: You measure a star to have a parallax angle of 0.12 arc-seconds What is the distance to this star in…

A: Write the given values of the problem- Parallax angle=0.12 arc-second

Q: A star has a period of P = 37 days. It has a radius of 5.7 times the radius of the sun. Calculate…

A: The period of the star: P = 37 days (37 x 24 x 60 x 60 seconds = 3.2 x 106 seconds); The radius of…

Q: Suppose a star has a luminosity of 7.0x1026 watts and an apparent brightness of 4.0x10-12 watt/m?.…

A: Given: The luminosity is 7x1026 W. The apparent brightness is 4x10-12 W/m2.

Q: Show that if two stars of the same luminosity form a close binary pair, the magnitude apparent light…

A: Let mass of star 1=m1 mass of star 2=m2 apparent magnitude of m1=x apparent magnitude of m2=y

Q: What is the luminosity of a star having four times the radius of the Sun and a surface temperature…

A: Given data The surface temperature of the star is: T = 8000 K The radius of the star is four-time…

Q: What is the luminosity of a star having three times the radius of the Sun and a surface temperature…

A: Given-The Surface  temperature of the star is T=10,000KThe radius of the star is three times of the…

Q: What is the mass of a star with a main-sequence lifetime of 6 billion years

A: Given: The main-sequence lifetime of a star is 6 billion years.

Q: Consider two stars on the main sequence, A and B. Star A has a mass of 4 M⊙. Star B has a mass of…

A: mass of star A = 4 M⊙mass of star B = 0.8 M ⊙

Q: The luminosity of a star is 6.6 x 1031 W and the peak wavelength in its spectrum is 4.6 x 10-7 m.…

A: Given  L = 6.6*10^(31) W  Wavelength = lambda = 4.6*10^(-7) m  Area = πR² = A  Temperature = T

Q: Calculate the main-sequence lifetimes of (a) a 4 ?⨀ star, and (b) a 0.75 ?⨀ star. Express the…

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Stellar evolution

We may see thousands of stars in the dark sky. Our universe consists of billions of stars. Stars may appear tiny to us but they are huge balls of gasses. Sun is a star of average size. Some stars are even a thousand times larger than the sun. The stars do not exist forever they have a certain lifetime. The life span of the sun is about 10 billion years. The star undergoes various changes during its lifetime, this process is called stellar evolution. The structure of the sun-like star is shown below.

Red Shift

It is an astronomical phenomenon. In this phenomenon, increase in wavelength with corresponding decrease in photon energy and frequency of radiation of light. It is the displacement of spectrum of any kind of astronomical object to the longer wavelengths (red) side.