What is the wavelength of the sound wave that reaches your ear in a 20∘c room?

Missing text in the problem (found on internet):
"A 70 cm -long steel string with a linear density of 1.0 g/m is under 200 N tension. It is plucked and vibrates at its fundamental frequency"

Solution: 
The frequency of the sound wave along the string is given by

where L=70 cm=0.7 m is the length of the string, T=200 N its tension and  is the linear density. Using these values in the formula, we find

Answer: buoyancy forceexplanation: in simple terms, the principle states that the buoyancy force on an object is equal to the weight of the fluid displaced by the object, or the density of the fluid multiplied by the submerged volume times the gravitational acceleration, g. this is also known as upthrust.

No it doesnt because it can be any number.