The Radiation of a Reference Blackbody Peaks at a Frequency $500 \times 10 ^ { 15 }$

Multiple Choice

The radiation of a reference blackbody peaks at a frequency of $500 \times 10 ^ { 15 }$ Hz. If a second blackbody has a peak radiation at half that frequency, its temperature is (compared to that of the reference body)

A) half as great.
B) twice as great.
C) exactly equal because they are both blackbodies.
D) More information is needed to work out the answer.