#1a (6 pts) . Estimate your luminosity. Remember, your emissivity is nearly unit

Question

#1a (6 pts). Estimate your luminosity. Remember, your emissivity is nearly unity at infrared wavelengths which is where you emit most of your radiation. Please list all of your assumptions.

#1b (6 pts) Compute the total energy you emit in a given day in units of Calories and compare this to the number Calories you ingest each day. Why are they so different? Note: The calorie, which is defined as the amount of energy needed to raise the temperature of one gram of water by one degree Celsius (4.184 J of energy), is not the same Calorie that is used when discussing nutrition. In fact, 1 C = 1000 c.

#1c (3 pts) What puts out more luminosity per mass, you or the Sun?

Explanation / Answer

Luminosity=Area of Object x sigma x temp^4

emissivity of a black black body=1

For general bodies <1

more luminousity has sun,because it has more Area than man(Depends on area)

1 cal=4.2joule

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