a thin metal is placed agains the teeth of a cog wheel the cog wheel is rotated at a - Science - Sound

Question

a thin metal is placed agains the teeth of a cog wheel
the cog wheel is rotated at a speed of 120 rotations per minute and
has 160 teeth calculate (A) frequency if the note produced (B) the
speed of sound , if the wavelength is 1 05 m

Urvashi Yadav · Accepted Answer

Given:

Frequency of the rotation = 120 rotation per minute

Wavelength = 1.05 m

Frequency of the rotation,

$ν = \frac{120}{60} = 2 H z$

1. Frequency of the node produced is,

$ν' = 2 \times 160 = 320 H z$

2. Speed of sound

$ν' = \frac{v}{λ} v = ν' λ = 320 * 1.05 = 336 m / \sec$

a thin metal is placed agains the teeth of a cog wheel. the cog wheel is rotated at a speed of 120 rotations per minute and has 160 teeth. calculate (A) frequency if the note produced (B) the speed of sound , if the wavelength is 1.05 m