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A child has an ear canal that is 1. 3 cm long. Sound frequencies in the audible range for the child to have increased hearing sensitivity is 6600 Hz to 19,800 Hz
The shape of the human ear is similar to a pipe that has a closed end and other end is open. Hence,
λ = 4L where L is the length of child's ear
Wavelength, λ = 4 × Length of the ear of the child
λ = 4 × 0.013m
λ = 0.052m
Frequency is the no. of oscillations per unit time.
The frequency of the sound, ν = c/λ
where c is the speed of sound i.e. 343 m/s
λ is the wavelength of sound
The child's audible range is equal to
ν = 343/0.052
ν = 6600Hz
We can also say that, ν is 13200 Hz or 19,800 Hz.
In general, the audible range of frequency for human ear is 20Hz to 20,000Hz.
Hence, sound frequencies in the audible range will the child have increased hearing sensitivity is 6600Hz to 19800 Hz.
Learn more about Frequency here, https://brainly.com/question/2140860
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