28. Go 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 thepower radiated by the sun. Our sun has a radius of 6.96 × 10° m. Assumingthat Sirius B has the same emissivity as the sun, find the radius of Sirius B.

Given: Sirius B radiates 0.040 times the power radiated by the Sun. The surface temperature of…

Answered: 28. Go Sirius B is a white star that…

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

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Chapter2: The Kinetic Theory Of Gases

Section: Chapter Questions

Problem 56P: (a) If the partial pressure of water vapor is 8.05 torr, what is the dew point? (760 torr = I atm...

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(a) If the partial pressure of water vapor is 8.05 torr, what is the dew point? (760 torr = I atm 101, 325 Pa) (b) On a warn day when the air temperature is 35 and the dew point is 25 , what are the partial of the water in the air and the relative humidity?
What mass of water at 25.0C must be allowed to conic to thermal equilibrium with a 1.85-kg cube of aluminum initially at 1.50 102C to lower the temperature of the aluminum to 65.0C? Assume any water turned to steam subsequently recondenses.
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 = i
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 x 10³ m. Assuming that Sirius B has the same emissivity as the sun, find the radius of Sirius B. RsB=
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? 5,796
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.
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).
An aluminum sphere of surface area (0.08} is heated to a temperature of (521}K If the rate of heat transfer by radiation from the aluminum sphere is (48}W, then calculate the emissivity of the sphere in square meters? (Stefan's constant o = 5.67 x 10-8 W/mK4) O a. 2214923651.4775 O b. 0.0008 O c. 0.1436 O d. 6.9628
25. B. A spherical infrared heater of radius 5.85 cm and an emissivity of 0.71 radiates 0.44 kW of power. Given, Stefan's constant = 5.67x10^-8 Wm^-2K^-4. Calculate, Temperature of the heater in Celsius:
Radiation from a Craft in Space.A space satellite in the shape of a sphere is traveling in outer space, where its surface temperature is held at 283.2 K. The sphere "sees" only outer space, which can be considered as a black body with a temperature of 0 K. The polished surface of the sphere has an emissivity of 0.1. Calculate the heat loss per m2by radiation.
The surface of the Sun has a temperature of 5500 °C. Treating the Sun as a perfect blackbody, with an emissivity of 1.0, find the power that it radiates into space. The radius of the Sun is 7.0 × 108m, and the temperature of space can be taken to be 3.0 K.
The amount of radiant power produced by the sun is approximately 3.9 × 1026 W. Assuming the sun to be a perfect blackbody sphere with a radius of 6.96 × 108 m, find its surface temperature (in kelvins).

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