A guitar string is vibrating at its fundamental frequency of $440Hz,$ which produces

sound waves in a hot air of $50C.$ What are the frequency and wavelength of the

sound waves? The molar mass of air is $28\mathrm{.}8\frac{g}{m}ol.$

A$.440Hz$ and $0\mathrm{.}821m$

B$.440Hz$ and $0\mathrm{.}782m$

C$.220Hz$ and $0\mathrm{.}782m$

D$.440Hz$ and $0\mathrm{.}323m$

E$.220Hz$ and $0\mathrm{.}323m$