How do frequency and pressure affect sound in Kundt's Tube?

[Fabio010]

Homework Statement

Kundt's Tube.First of all, i used a aluminum rod.

Then i rubbed it to cause vibration .

Homework Equations

a)How can i change the frequency of the sound produced in tube.

b)What is the difference of rubbing the metal with more pressure?

The Attempt at a Solution

a)
Changing the material of the rod. (I think that is the only way to change the frequency produced by sound in the interior of the tube, because :

vsound/λsound = v(material of the rod)/λmaterial of the rod = frequency

$\frac{vgas}{λgas}$ = $\frac{v(material of the rod)}{λmaterial of the rod}$ = frequencyb)

The intensity(amplitude) of the sound. When i applied more pressure rubbing the rod, a louder sound was produced.
Is it correct??

Help is always appreciated.

 

[member 553083]

Yes, your answer is correct. The frequency of the sound produced in the tube can be changed by changing the material of the rod, and applying more pressure when rubbing the rod will increase the intensity (amplitude) of the sound.