How does radius of betelgeuse compare to the sun radius

Assignment Help Physics

Reference no: EM131019918

The sun is the only star whose size we can easily measure directly; astronomers therefore estimate the sizes of other stars using Stefan's law.

(a) The spectrum of Sirius A, plotted as a function of energy, peaks at a photon energy of 2.4 eV, while Sirius A is approximately 24 times as luminous as the sun. How does the radius of Sirius A compare to the sun's radius?

(b) Sirius B, the companion of Sirius A (see Figure), is only 3% as luminous as the sun. Its spectrum, plotted as a function of energy, peaks at about 7 eV. Howdoes its radius compare to that of the sun?

(c) The spectrum of the star Betelgeuse, plotted as a function of energy, peaks at a photon energy of 0.8 eV, while Betelgeuse is approximately 10,000 times as luminous as the sun. How does the radius of Betelgeuse compare to the sun's radius? Why is Betelgeuse called a "red supergiant"?

Reference no: EM131019918

Questions Cloud

Implementation of closed-loop amplifiers : Find the ft required for internally compensated op amps to be used in the implementation of closed-loop amplifiers with the following nominal dc gains and 3-dB bandwidths:

Dc gain and the frequency : Measurements made on the internally compensated amplifiers listed below provide the dc gain and the frequency at which the gain has dropped by 20 dB. For each, what are the 3 dB and unity-gain frequencies?

Estimate the total power radiated by your body : Estimate (roughly) the total power radiated by your body, neglecting any energy that is returned by your clothes and environment. (Whatever the color of your skin, its emissivity at infrared wavelengths is quite close to 1; almost any nonmetal is ..

Net radiative heat transfer from surface : Consider two aligned, parallel, square planes (0.4 m × 0.4 m) spaced 0.8 m apart and maintained atT1 = 500 K and T2 =800 K. Calculate the net radiative heat transfer from surface 1 for the following special conditions:

How does radius of betelgeuse compare to the sun radius : The spectrum of the star Betelgeuse, plotted as a function of energy, peaks at a photon energy of 0.8 eV, while Betelgeuse is approximately 10,000 times as luminous as the sun. How does the radius of Betelgeuse compare to the sun's radius? Why is ..

Derive the total profit for monopolist : What is Player 2s dominant strategy now - What is the new equilibrium? What is the payoff to Player 2 in the new equilibrium?

Steady-state temperatures of two radiation shields : Determine the steady-state temperatures of two radiation shields placed in the evacuated space between two infinite planes at temperatures of 600 and 325 K. All the surfaces are diffuse and gray with emissivities of 0.7.

Estimate the equilibrium surface temperature of the earth : Suppose that the concentration of infrared-absorbing gases in earth's atmosphere were to double, effectively creating a second "blanket" to warm the surface. Estimate the equilibrium surface temperature of the earth that would result from this cat..

Why no negative values are chosen as values to substitute : Explain why no negative values are chosen as values to substitute in for x. Graph in MS Excel or another web-based graphing utility and paste your graph here.

User Account

All Pages