A star has a power output of 2.5 x 1026 W and a radius of 8.92 x 108 m. Calculate the surface temperature of the star.
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Q: What is the vrms of hydrogen on the surface of the sun if its temperature is 5.36E3 degC? What is…
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- What is the vrms of hydrogen on the surface of the sun if its temperature is 5.36E3 degC? What is the vrms of hydrogen on the surface of the earth if its temperature is 21.2 degC?A window has heavy curtains in front of it. At night the curtains are closed to minimise heat loss. During the day the curtains are pulled aside exposing the glass window. How much heat is lost through the 1.0 m x 1.0 m square glass window pane that is 4mm thick when the inside temperature is 20 degree C and the outside temperature is -6 C (negative 6.0) in 12 hrs? ( 1m = 100 cm) (1m = 1000mm) %3DSirius 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= O
- The next four questions use this description. Our Sun has a peak emission wavelength of about 500 nm and a radius of about 700,000 km. Your dark-adapted eye has a pupil diameter of about 7 mm and can detect light intensity down to about 1.5 x 10-11 W/m2. Assume the emissivity of the Sun is equal to 1. First, given these numbers, what is the surface temperature of the Sun in Kelvin to 3 significant digits? What is the power output of the Sun in moles of watts? (in other words, take the number of watts and divide it by Avogadro's number) Assuming that all of the Sun's power is given off as 500 nm photons*, how many photons are given off by the Sun every second? Report your answer to the nearest power of 10 (e.g. if you got 7 x 1024, give your answer as 25).If an incandescent light bulb has a luminosity L= 60W and a filament temperature of T= 2900K, what must be the surface area of its filament? If the filament consists of a cylindrical wire with diameter d= 4.6×10^−5m (as in a standard incandescent 60 watt, 120 voltbulb), what is the length of the wire?Please asap
- Water with a mass of 0.500 kgkg at 15.0∘C∘C is mixed with 0.800 kgkg of water at 35.0∘C∘C. What is the final temperature TfTfT_f of the mixture?Hydrothermal vents are openings in the ocean floor that discharge very hot water. The water emerging from one such vent off the Oregon coast, 2400 m below the surface, is at 279 C. Despite its high temperature, the water doesn’t boil. Why not?