If a neutron star has a radius of 15 km and a temperature of 7.5 x 106 K, how luminous is it? Express your answer in watts and also in solar luminosity units. (Hint: Use the relationUse 5,800 K for the surface temperature of the Sun. Theluminosity of the Sun is 3.83 × 1026 w.)luminosity in wattsluminosity in solar luminosity unitsLo

The luminosity relation is, LLθ=RRθ2TTθ4 the radius of the sun 696,340 km. Therefore, LLθ=15 km696340 km27.5×106 K 5800 K4L=1297.4 Lθ and in watts, LLθ=15 km696340 km27.5×106 K 5800 K4L=1297.4 Lθ=1297.4 3.83×1026 W=4.97×1029 W

Answered: If a neutron star has a radius of 15 km…

Similar questions

If a neutron star has a radius of 13 km and a temperature of 9.0 x 10° K, how luminous is it? Express your answer in watts and also in solar luminosity units. (Hint: Use the relation . Use 5,800 K for the surface temperature of the Sun. The luminosity of the Sun is 3.83 × 1026 w.) luminosity in watts w luminosity in solar luminosity units Lo
Calculate the luminosity of the star with an apparent magnitude of 2. Given the Sun has an apparent magnitude of -26.57 and 3.9 × 1026 W luminosity.
A red giant star has a temperature of 3900 K and a luminosity of 13600 LSun. How many times bigger is this star than the Sun? Hint: You need the surface temperature of the sun for this problem. Use the value in the book, 5800K.
I need the answer as soon as possible
f a star has a luminosity of 4*10^26 Watts and a brightness of 1.4*10^3W/m2, how far away is it?
A star has a radius of 2RO and has a temperature of 3TO. Calculate the luminosity in solar units.
A star is listed in a catalog as being a type G2V.a) What is the star’s spectral class?b) What is the star’s luminosity class?c) What is the peak color of the star?d) Name an example of a star that has this type.
(Answer don't copy with hand written please)As a star runs out of hydrogen to fuel nuclear fusion in its core, changes within the star usually cause it to leave the main sequence, expanding and cooling as it does so. Would a star with a radius 12 times that of the Sun, but a surface temperature 0.5 times that of the Sun, be more, or less luminous than the Sun? Show and explain your reasoning. You may assume the surface area of a sphere is A = 4πr2.