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Suppose a protostar has a luminosity of
157,341
Lo
and a surface temperature of 4,540 K
(Kelvins). What is the radius of this
protostar?
[Enter your answer as a multiple of the
Sun's radius. I.e., if you find R = 20
Ro
enter 20. This problem is easier if you
start with the relevant equation and
create a ratio using the Sun's values.
Recall that the Sun has a surface
temperature of 5778 K. ]

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