Calculate the frequency of beats produced in air when two sources of sound are activated, one emitting a wavelength of $32 c m$ and the other of $32.2 c m$ . The speed of sound in air is $350 m / s$

3 H z

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5 H z

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7 H z

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2 H z

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Solution

The correct option is C $7 H z$
Given : $λ_{1} = 32 c m$ and $λ = 32.2 c m$
Velocity of sound in air $v = 350 m / s = 35000 c m / s$
Beat frequency $b = | f_{1} - f_{2} | = \frac{v}{λ_{1}} - \frac{v}{λ_{2}}$
$∴$ $b = \frac{35000}{32} - \frac{35000}{32.2} = 7 H z$

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Calculate the frequency of beats produced in air when two sources of sound are activated, one emitting a wavelength of 32cm and the other of 32.2cm. The speed of sound in air is 350m/s

The correct option is C 7HzGiven : λ1=32 cm and λ=32.2 cmVelocity of sound in air v=350 m/s=35000 cm/sBeat frequency b=|f1−f2|=vλ1−vλ2∴ b=3500032−3500032.2=7 Hz

Calculate the frequency of beats produced in air when two sources of sound are activated, one emitting a wavelength of $32 c m$ and the other of $32.2 c m$ . The speed of sound in air is $350 m / s$

The correct option is C $7 H z$
Given : $λ_{1} = 32 c m$ and $λ = 32.2 c m$
Velocity of sound in air $v = 350 m / s = 35000 c m / s$
Beat frequency $b = | f_{1} - f_{2} | = \frac{v}{λ_{1}} - \frac{v}{λ_{2}}$
$∴$ $b = \frac{35000}{32} - \frac{35000}{32.2} = 7 H z$