Suppose the surface temperature of the Sun were about 18,000 K, rather than 6,000 K. How much more thermal radiation would the Sun emit? How would the thermal radiation spectrum of the Sun be different?
What will be an ideal response?
From the first rule of thermal radiation, we know that tripling the temperature of an object increases the amount of thermal radiation it emits per unit area by a factor of 34 = 81. Thus, increasing the surface temperature of the Sun from 6,000 K to 18,000 K would increase its thermal radiation by a factor of 81. The higher temperature of the Sun would shift the peak of its thermal radiation spectrum from its current place in the visible light region into the ultraviolet. The hotter Sun would emit more energy at all wavelengths, with the greatest output coming in the ultraviolet.
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Predict the dislocation density present if polycrystalline copper is work hardened to a shear yield strength of 500 MPa, using the results of Example Problem 7.1.
What will be an ideal response?
The atmosphere on Mercury is due to
A) volcanic outgassing. B) evaporation. C) sublimation. D) bombardment. E) There is no detectable atmosphere on Mercury.
The advantage of a fusion reactor when compared to a fission reactor is which of the following?
a. The fuel is cheaper. b. There is less radioactive waste material. c. Both choices above are valid. d. None of the above choices are valid.
How many days are required for a radioactive sample, with a half-life of 5.7 d and an initial activity of 1.07 × 105 Bq, to decay to an activity of 100 Bq?
A) 57 d B) 46 d C) 68 d D) 39 d