Assume that your body (with temperature of 310 K and a surface area of 2 m2) can be approximated as a blackbody. How much energy does does the body radiate per second?
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Assume that your body (with temperature of 310 K and a surface area of 2 m2) can be approximated as a blackbody.
How much energy does does the body
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- The power emitted by a blackbody is proportional to T^4. If the temperature of the blackbody goes from 3000K to 6000K, by how much (by what factor, 2, 3, 8, etc) does the power increase?Suppose a blackbody at 425 K radiates just enough heat in 15.0 min to boil water for a cup of tea. How much time t will it take to boil the same water if the temperature of the radiator is 525 K? t = ? sAssume you are a perfect blackbody at a temperature of T = 310 K. What is the rate, in watts, at which you radiate energy? (For the purposes of this problem, you may assume you are spherical.)
- The Sun's mass is1.989 ×10^8 and it radiates at a rate of 3.827×10^23 kW. a) From this data, assuming it converts all its mass into energy, what is the estimate the lifetime of the Sun? b) Theoretical calculations predict the Sun's lifetime (in its current stage) to be about 5 billion years. During that time, what percentage of its mass will it lose?A blackbody radiator in the shape of a sphere has a surface area of 15 ^ 2 * m . if it has a temperature of 1200 K how much energy does it emit per second?Two stars, both of which behave like ideal blackbodies, radiate the same total energy per second. The cooler one has a surface temperature T and 4.0 times the diameter of the hotter star. What is the temperature of the hotter star in terms of T?
- A piece of iron is heated with a torch to a temperature of 858 K. How much more energy does it emit as blackbody radiation at 858 K than it does at room temperature, 290 K? E858 E290 =A black body measures 20cm by 15cm. If the temperature of the object is 2500K how much energy does it emit per second?A copper cylinder with a temperature of 307 K is found to emit 124 J of energy each second. If the cylinder radiates like a blackbody, what is its surface area?
- A star’s spectrum emits more radiation with a wavelength of 690.0 nm than with any other wavelength. If the star is 9.78 ly from Earth and its radius is 7.20 × 108 m, what will an Earth-based observer measure for this star’s intensity? Stars are nearly perfect blackbodies. (Note: ly stands for light-years.) Answer in W/m2A steel spherical object is pulled from an oven at temperature 500C and placed on a surface in an environment at20C. Given the sphere's radius of 10cm, how long will it take to cool to 400C via blackbody radiation, which will beits primary means of losing heat? How long will it take if the radius is only 5cm? Explain the variation.the power emitted by a blackbody is proportional to T^4 if the temperature of the blackbody goes from 3000k to 6000k by how much does the power increase? (By what factor, 2,4,6 etc)