Speed of sound in air from density and bulk modulus

[brv]

Homework Statement

The density of a sample of air is 1.211 kg/m3, and the bulk modulus is 1.42 · 105 N/m2.


a) Find the speed of sound in the air sample.


b)Find the temperature of the air sample. Give answer in °C.

Homework Equations

The Attempt at a Solution

I found the part a it's
It's 342.43 m/s
But i find b wrong everytime.What i use is; sqrt[(1.4 x r x T)/M] = speed
But maybe i know the some values wrong? Help please.

 

[SteamKing]

In the calculation, T must be an absolute temperature.

If you show your calculations, it might help us pinpoint what is going wrong.