If one star has a temperature of 5600 K and another star has a temperature of 8000 K, how much more energy per second will the hotter star radiate from each square meter of its surface?

Q: How many times brighter or fainter would a star appear if it were moved to: a. twice its present…

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Q: A star is known to be moving at 7.87km/s toward the earth. If you observe the spectral line to be at…

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

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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: 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 surface temperature of a star that emits at a peak wavelength of 400 non? 1nm=1x10(-9) m

A: The peak wavelength λmax=400nm = 400×10-9m

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

A: The given problem depends upon the Doppler Effect of light. Blue Shift: The displacement of the…

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

A: Luminosity of a star of radius R and surface temperature T is given by L=4πσR2T4 where is the…

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

A: Given:

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: 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 star Alpha X (fictitious star) has a surface temperature of 23,100 K. How much more energy is…

A: Using Stephan’s Law, the flux of the star and the sun F=EA=σT4

Q: Suppose a star has a luminosity of 7.0x1026 watts and an apparent brightness of 4.0×10-12 watt/m?.…

A: Luminosity of star (L) = 7×1026 watt Apparent brightness (AB) = 4×10-12 Wm2

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

A: To solve the problem, we will use Wein's displacement law. This formula is widely used in…

Q: Two stars have the difference between their apparent magnitudes +5, so their apparent luminosity…

A: The difference between the apparent magnitude is given as m1-m2=+5

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: High AO 80 Co OD OE FO Low High Low Temperature According to the graph above, which star is the…

A: Solution, Given graph brightness and temperature of different star an object is said to be hottest…

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: A star has a surface area of 6.92x1018 m2. How much power does it radiate if it has a surface…

A: (given)   Surface area (A) of star = 6.92 x 1018 m2 Surface temperature (T) = 6,017 K σ is the…

Q: If a certain star is 4 times as hot as the sun and is 10000 times brighter than the sun, calculate…

A: Given, Temperature of star, TA=4xTE, Luminosity of star, LA=10000x LE.

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: If light from one star is 1,600 times brighter (has 1,600 times more flux) than light from another…

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Q: If you find that the hydrogen alpha line in a star's spectrum occurs at a wavelength of 656.45 nm,…

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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…

Q: A star has a surface area of 6.11x1018 m2. How much power does it radiate if it has a surface…

A: Given data: Surface Area (A) = 6.11×1018 m2 Temperature (T) = 6,682 K Required: Power radiated by…

Q: The surface temperature of the Sun is 5,800 K.   What wavelength of light is most intense?…

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Q: The Hertzsprung-Russell diagram shows that for most stars, as the absolute magnitude increases, the…

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: How many times hotter than our sun is the hottest type O star, which has a surface temperature…

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

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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: An astronomer observes several stars with different colors. Rank them in order from highest…

A: Temperature is related to color of a star and follows colors of rainbow. Blue stars are the hottest…

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: 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: Earth tugs the Sun around as it orbits, but it affects the radial velocity of the sun by only…

A: ∆λ=λ0vc

Q: For stars C and D, what is the main difference between them? O Their brightness, C is brighter than…

A: Required : Difference between stars C and D.

Q: n astronomer discovers a star that has a peak frequency of 1.3×1014 Hz. Determine the temperature of…

A: Given: The frequency of the beam is 1.3x1014 Hz.

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.