
The Sun is a slightly variable star. What if the surface temperature of the Sun were...
Sirius B is a white star that has a surface temperature (in kelvins) that is four times that of our sun. Sirius B radiates only 0.040 times the power radiated by the sun. Our sun has a radius of 6.96 108 m. Assuming that Sirius B has the same emissivity as the sun, find the radius of Sirius B. RsB =
Part A. What would be the luminosity of the Sun if its surface temperature were 3900 K and its radius were 1.5 AU ? Part B. What would be the luminosity of the Sun if its surface temperature were 3900 K and its radius were 7.0 AU ? *I don't understand how to calculate this out. Instructor didn't really cover this.
The surface of the sun has a temperature of approximately 5800 K. To good approximation we can treat it as a blackbody. (a) What is the peak-intensity wavelength λm? (b) What is the total radiated power per unit area? (c) Find the power per unit area radiated from the surface of the sun in the wavelength range 600.0 to 605.0 nm.
The Sun's surface is a blackbody with a surface temperature of 5800 K. a) at what wavelength does the sun emit most strongly? b) what is the total radiated power per unit surface area? c) what is the total radiated power over the entire surface?
The surface of the Sun has a temperature of 5500 ∘C. Treat the sun as a perfect blackbody with an emissivity of 1.0 and a radius of 7.0*10^8 m. Given; the temperature of space is 3.0K and the power that it takes for the sun to radiate into space is 3.9 * 10^26 W. The solar constant is the number of watts of sunlight power falling on a square meter of the Earth's upper atmosphere. Calculate the solar constant given...
The bright star Rigel in the constellation Orion has a surface temperature about 1.6 times that of the Sun. Its luminosity is about 64,000 times that of the Sun. What is Rigel's radius compared to the radius of the Sun (in units of solar radii, Rø)?
The average temperature of the surface of the Earth is approximately 14◦C. What would the steady-state temperature of the Earth be if there were no greenhouse effect — i.e. if the emissivity of the earth was independent of wavelength? Give your answer in ◦C. Note that the radius of the Earth is 6.38 106 m, and the intensity of sunlight at the Earth’s location is 1366 W/m2. Hint, how much power from the sun would strike a plate with the...
The surface of the sun is 5850k and the surface temperature of Sirius is 9950K. Assuming both have the same emissivity, the radiative heat current emitted from sirius is greater than that of the sun by what factor?
Physics problem I need help with!
The average temperature of the surface of the Earth is
approximately 14°C. What would the steady-state
temperature of the Earth be if there were no greenhouse effect —
i.e. if the emissivity of the earth was independent of wavelength?
Provide answer in °C. Note that the radius of the
Earth is 6.38×10^6 m, and the intensity of sunlight at the Earth’s
location is 1366 W/m^2. (Hint, how much power from the sun would
strike...
Betelgeuse, a bright red star in the constellation Orion, has a luminosity that is 100,000 times that of the Sun However, the surface temperature of Betelgeuse is only 3000 K. Assuming that the emissivity of stars is 1, find the radius of Betelgeuse.