Question

5. Wien's Law and Stefan-Boltzmann Law A supergiant star has a surface T of 21,000 K. Its power output is 80,000 times that of the Sun; the Sun's power is 3.9 x1026 W. a. What is Amax for this supergiant star? b. What part of the electromagnetic spectrum is this? c. What is the radius of this supergiant, in meters? Treat it as a perfect black bod d. How many solar radii is this? y. An old-school lightbulb is about 6 cm wide at its widest point. Suppose you have such a bulb with power of 100 W e. What's the surface temperature of this bulb in Fahrenheit, if vou treat it as a black body? f. Could you bake cookies with this? 325 °F would be required. g. What is Amax for this bulb? h. What part of the spectrum is this? Does this match your experience?How can vou detect this?

Answer 1