What is the Resonant Frequency of a 2-Year Old's Outer Ear?

[Derek1997]

Homework Statement

A 2-year old child has an outer ear length of approximately 1.7 cm (compared to 2.5 cmfor an adult). Find the resonant frequency of the outer ear of the average 2 year old
b.Draw a diagram of the natural harmonic for the child’s ear.

Homework Equations

f=v/waveleng
where wavelengt= 4L

The Attempt at a Solution

for a, i used the equation, for baby i got 343/0.068= 5.04KHz am i right?
Also for b, do i need to draw the damped version of the graph? cheers.

 

[kuruman]

You are correct on (a)
For (b) you need to draw the fundamental waveform that you used to answer part (a). I am not sure what you mean by "damped version."

 

[Derek1997]

You are correct on (a)
For (b) you need to draw the fundamental waveform that you used to answer part (a). I am not sure what you mean by "damped version."

Hi, so the one on which the graph rises at 5khz and the falls back down. so what i mean is it's moving straightline as it approaches 5khz, it will rise then decrease as we pass the 5. is it right?

 

[kuruman]

You are thinking of a driven damped harmonic oscillator resonance curve, I think this question is asking for something simpler, something like the static graphs presented here
http://www.acs.psu.edu/drussell/Demos/StandingWaves/StandingWaves.html

 

[Derek1997]

ohhh so you mean the tube one? in which it has a close at one end?

 

[kuruman]

Yes.

 

[Derek1997]

Yes.

like for you son <3