If the Dust Around a Protostar Radiates Most Strongly at 30

Multiple Choice

If the dust around a protostar radiates most strongly at 30 microns or 30,000 nm, what is the approximate temperature of that dust Hint: T in K = 3,000,000/wavelength in nm or use Wien's Law.

A) 100,000 K
B) 10,000 K
C) 1000 K
D) 100 K
E) 10 K