The speed of sound in oxygen ($$O_2$$) at a certain temperature is $$460\ ms^{-1}$$. The speed of sound in helium (He) at the same temperature will be (assumed both gases to be ideal)

A

$$460\ ms^{-1}$$

B

$$500\ ms^{-1}$$

C

$$650\ ms^{-1}$$

D

None of these