If two stars, star A and star B, have equal radii, but star A is ten times more luminous than star B, what can we conclude about the temperature of star B relative to star A (the ratio TB/TA)

Q: In Exercise 12.4 of your book, University Physics 15th edition (see End of the Chapter 12 section),…

A: As given, Mass of Neutron star is equal of mass of Sun. MN=MS=M=1.989×1030 kg Radius of neutron…

Q: What is therate of thermal radiation emittedfrom a star witha radius of 2.310x 109mand a surface…

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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 is the ratio of the percent of metals in extreme Population I stars (3%) to that in extreme…

A: Given data: The percent of metals in extreme Population I stars is Npop I=3%  The percent of metals…

Q: Star B has a temperature that is 5 times higher than Star A. How much more energy per second…

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Q: A star such as our Sun will eventually evolve to a “red giant” star and then to a “white dwarf”…

A: Given that, The surface temperature of the white dwarf, Tw=2.5×103 K The surface temperature of the…

Q: The spectrum of a typical star shows absorption lines at different wavelengths than their laboratory…

A: In the case of separating observed wavelength increases compared to a real wavelength that is also…

Q: A star with spectral type A0 has a surface temperature of 9600 K and a radius of 2.2 RSun. How many…

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Q: A star is found with a luminosity 2*104 greater than the sun and a photosphere (`surface’)…

A: We have to consider two given facts 1: the star is much luminous than our star 2: the star has a low…

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: 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: If Vega is apparent magnitude zero, and Deneb first magnitude, then     Vega must be 2.5× hotter…

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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: Which star is brighter as seen from the Earth? (you only have one try for this problem) A) A star…

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Q: n hydrogen, the transition from level 2 to level 1 has a rest wavelength of 121.6 nm. Find the speed…

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Q: Pls help ASAP. Pls show all work.

A: Your answer is option (b).

Q: You can estimate a star’s radius R(meters) by its luminosity L(Watts) and its surface temperature…

A: Luminosity of star can be expressed by he following formula; L=4πR2σT4 Stephen-Boltzmann constant…

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: Assume that an O main-sequence star (40,000 K) and a G main-sequence star (5,500 K) have the same…

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Q: Consider three main sequence stars: Star A is 12000 K, Star B is 6000 K, Star C is 3000 K. What are…

A: Given, Star A = 12000 K temprature  Star B = 6000 K temprature  Star C = 3000 K temprature   So the…

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: ou observe a star with a telescope over the course of a year. You find that this star has a flux…

A: .In vertical direction:psinθ=40sin60Psinθ=4032Psinθ=34.6410 free body diagram:

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: 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: spectrum of this star, the H alpha line is observed to have a wavelength of 656.034 nm when measured…

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Q: Given star A with apparent visual magnitude mv = 6.5, and star B with mv = 4.4, what is the flux…

A: Given, star A with apparent visual magnitude mA = 6.5, and star B with mB = 4.4, the flux ratio…

Q: If a T Tauri star is the same temperature as the Sun but is seventeen times more luminous, what is…

A: Given that  The temperature of the Tauri Star(Tt) is the same of the sun( Tsun).…

Q: (a) The surface temperature of a star is 25,000 K and it has a luminosity about 1% that of our Sun.…

A: Luminosity: It is the total amount of electromagnetic energy emitted per unit of time by an object.…

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A: To solve the given question, we will use conservation of angular momentum.

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A: Given: m=10 diameter=0.07 t=79 min

Q: In Exercise 12.4 of your book, University Physics 15th edition (see End of the Chapter 12 section),…

A: Given Radius of neutron star ,R=87.093 km

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Q: at is the wavelength corressponding to the most intense light emitted by a giant star od surface…

A: Given values:- Temperature,(T)=5000 K ----(1) Constant of proportionality,(b)=2.90 x 10-3 m-K…

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Q: If a star gives off light at a peak wavelength of 6.80x10-7 m. What would be the temperature of this…

A: Given peak wavelength = 6.8×10-7m

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A: Introduction: A star`s composition, structure and temperature changes during its lifetime. Ejnar…

Q: A star is known to be moving at 8.93km/s toward the earth. If you observe the spectral line to be at…

A: The velocity can be expressed as, v=λobs-λactλactc

Q: Which of the following stars has the highest surface temperature? Treat the star as a blackbody.…

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Q: If a star has a surface temperature of 25,000 K (2.50 ✕ 104 K), at what wavelength (in nm) will it…

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Q: You receive 8 × 10−9 W/m2 of energy from a star that is 2 parsecs away, it has a V -band apparent…

A: Given that we receive 8×10−9 W/m2 of energy from a star that is 2 parsecs away, it has a V -band…

Q: In Exercise 12.4 of your book, University Physics 15th edition (see End of the Chapter 12 section),…

A: Given: Radius of neutron star = 93.106 km Mass is equal to sun = 1.989 × 1030 kg To determine:…

Q: A main sequence star of mass, M, and radius, R, collapses to a white dwarf star with a radius 1.0%…

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Q: star that is moving toward Earth will   a. have its spectral lines shifted to the red.   b. have…

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Q: We can tell what molecules are in a distant star by: Group of answer choices a)the star’s…

A: The astronomers use the spectroscopy method to determine the composition of planets and stars.

Q: If Star A's temperature is 5000 K and Star B's wavelength of peak emission is 5/7 as long as that of…

A: GivenTA = 5000 KλB =57λA

Q: A star with spectral type A0 has a surface temperature of 9600 K and a radius of 2.2 RSun. How many…

A: Disclaimer: Since you have asked multiple question, we will solve the first question for you. If you…

Q: star has a surface area of 6.49x1018 m2. How much power does it radiate if it has a surface…

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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.