Mathematics: Apolice car is parked by the side of a highway and its siren emits a sound measuring 750 hz. as you approach the police car from a distance, you hear a change in the sound. the change is in the sound s a) frequency. b) pitch and frequency. c) frequency and wavelength. d) pitch, intensity, and loudness.

Apolice car is parked by the side of a highway and

Ответ:

Ladarius622

15.01.2022

This is called the Doppler effect. It's essentially a compression of the sound wave. When the sound wave compresses, the wavelength is therefore decreased. Becasue frequency is inversely related to the wavelength, the frequency is changed as well.

F = v/λ

F - frequency
v - velocity
λ - wavelength

Apolice car is parked by the side of a highway and its siren emits a sound measuring 750 hz. as you

Apolice car is parked by the side of a highway and its siren emits a sound measuring 750 hz. as you

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Ответ:

AM28

19.11.2022

Mathematics

$=\left(x+4\right)\left(x-9\right)$

Step-by-step explanation:

$x^2-5x-36\\\mathrm{Break\:the\:expression\:into\:groups}\\=\left(x^2+4x\right)+\left(-9x-36\right)\\\mathrm{Factor\:out\:}x\mathrm{\:from\:}x^2+4x\mathrm{:\quad }x\left(x+4\right)\\\mathrm{Factor\:out\:}-9\mathrm{\:from\:}-9x-36\mathrm{:\quad }-9\left(x+4\right)\\=x\left(x+4\right)-9\left(x+4\right)\\\mathrm{Factor\:out\:common\:term\:}x+4\\=\left(x+4\right)\left(x-9\right)$

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