Question

Considering the length of your resonance tube, what is the lowest frequency tuning fork you could use for this experiment? Show your calculations!

If the tubing is 25 cm long and we are at 20°C, we can solve for frequency as follows:

Tuning fork Frequency, Hz	Length, L,	Diameter of Tube, D	λ = 4(L + 0.3d)	Experimental v = f λ	Room Temperature, °C
384	0.065m	0.022m	0.2864m	109.98	20

Answer 1

Theoretical speed of sound is given as = 342.9+ 0.6T ( here T is the local temperature )

Therefore speed of sound a 20⁰ C is = 354.9 m/s

Now Length of tube is given as 0.25 m

In such a tube the longest wavelength is given by  

given L=0.25 m and d=0.022 m we have  

Therefore lowest frequency is given by