A child has an ear canal that is 1.3 cm long. Assume the speed of sound is v = 344 m/s. At what sound frequencies in the audible range will the child have increased hearing sensitivity?

Express your answer using two significant figures. Enter your answers numerically separated by commas.

The  frequencies are

Explanation:

From the question we are told that

  The  length of the ear canal is  

   The  speed of sound is assumed to be  

Now  taking look at a typical  ear canal  we see that we assume it is  a  closed pipe

   Now the fundamental harmonics for the pipe(ear canal) is mathematically represented as

 substituting values  

Also the the second harmonic for the pipe (ear canal) is mathematically represented as

 substituting values  

Given that sound would be loudest in the pipe at the frequency, it implies that the child  will have an increased audible sensitivity at this  frequencies