Question

A turning fork vibrating at a frequency of 300 Hz is held over the top of a jar filled with water
and fitted with a tap at the bottom. If the jar is 100 cm tall and the speed of sound is 350 m/s,
determine the possible resonance positions (Neglect end correction

Answer 1

$$\lambda=\frac{v}{f}=\frac{350}{300}=1.167\ m$$

1st resonance at 

$$d_1=\frac{116.7}{4}=29\ cm$$

2nd resonance at 

$$d_2=3\frac{116.7}{4}=88\ cm$$