A dim star of magnitude + 14.5 explodes into a nova of magnitude + 2. The factor by which the brightness of the star has increased is
12.5
102
105
104
C.
105
If the sun becomes twice as hot
the output of radiated energy will be eight times larger
it will radiate predominantly in the infrared
it will radiate predominantly in the ultraviolet
the output of the radiated energy will be eight times smaller