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Gre4nikov [31]
3 years ago
7

One brand of dog whistles claims a frequency of 25 kHz for its product. What is the wavelength of this sound? (the speed of soun

d in air is 343 m/s)
0.01372 m
0.02181 m
0.01748 m
0.011654 m
Physics
1 answer:
Alex787 [66]3 years ago
4 0

Answer:

Option A

0.01372 m

Explanation:

The speed of sound is a product of the wavelength and frequency hence

Speed=Wavelength * Frequency

Making wavelength the subject then

Wavelength=\frac {speed}{frequency}

Substituting 343 m/s for speed and 25 kHz= 25000 Hz for frequency we obtain

Wavelength=\frac {343}{25000}=0.01372 m

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Answer:

α = 3×10^-5 K^-1

Explanation:

let ΔL be the change in length of the bar of metal, ΔT be the change in temperature, L be the original length of the metal bar and let α be the coefficient of linear expansion.

then, the coefficient of linear expansion is given by:

α = ΔL/(ΔT×L)

   = (0.3×10^-3)/(100)(100×10^-3)

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Therefore, the coefficient of linear expansion is 3×10^-5 K^-1

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The correct choice is

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Answer:

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