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Unformatted text preview: tude of 8 and the observed magnitude of
11.7 on January 21, how many times brighter are we estimating this
supernova will get?
3. Show that an error or uncertainty of δ ( m − M ) = 0.1 magnitudes in the distance
modulus is roughly equivalent to a 5% error in d such that
Propagation of errors is your friend as is derivative δd
= 0.05 . HINT:
10 = 10 x ln (10 ) .
dx 4. [C&O 3.8] The average person has 1.4 m2 of skin at a skin temperature of
roughly 306K (92°F). Consider the average person to be an ideal radiator standing
in a room at a temperature of 293K (68°F).
a. Calculate the energy per second radiated by the average person in the form
of blackbody radiation. Express your answer in watts.
b. Determine the peak wavelength λmax of the blackbody radiation emitted by
the average person. In what region of the electromagnetic spectrum is this
c. A blackbody also absorbs energy from its environment, in this case from
the 293K room. The equation describing the absorption is the same as the
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This document was uploaded on 03/04/2014 for the course ASTROPHYS 362 at Minnesota State University Moorhead .
- Spring '14