At what temp will the vilocity of sound be double its value at 273k
A 1042k
B 1097k
C 1092k
D 1121k
10 seconds with google (or, I suspect a minute or two in your class text) would have provided:
331 m/s is the speed of sound in air at 0° C.
The formula to find the speed of sound in air is as follows:
v = 331m/s + 0.6m/s/°C * T
So, solve that when v = 662 m/s. Note that the formula just adds an amount for every degree C or K, which are the same size.