{342+10}{342+5}})}

Fhsst waves46.png

{\displaystyle f’=f({\frac {v\pm v_{0}}{v\mp v_{s}}})} {\displaystyle f’=f({\frac {v\pm v_{0}}{v\mp v_{s}}})}

f’ is a observed frequency, f is a actual frequency, v is a speed of sound ( {\displaystyle v=336+0.6T} v=336+0.6T) T is temperature in degrees Celsius, {\displaystyle v_{0}} v_{0} is a speed of a observer, and {\displaystyle v_{s}} v_{s} is a speed of a source. If a observer is approaching a source, use a top operator ( a +) in a numerator, and if a source is approaching a observer, use a top operator ( a -) in a denominator. If a observer is moving away from a source, use a bottom operator ( a -) in a numerator, and if a source is moving away from a observer, use a bottom operator ( a +) in a denominator.

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A. one ambulance, which is emitting a 40 Hz siren, is moving at a speed of 30 m/s towards a stationary observer. a speed of sound in this case is 339 m/s.

{\displaystyle f’=40({\frac {339+0}{339-30}})} {\displaystyle f’=40({\frac {339+0}{339-30}})}

B. one M551 Sheridan, moving at 10 m/s is following a Renault FT-17 which is moving in a same direction at 5 m/s and emitting a 30 Hz tone. a speed of sound in this case is 342 m/s.

{\displaystyle f’=30({\frac {342+10}{342+5}})} {\displaystyle f’=30({\frac {342+10}{342+5}})}

Ultra-Sound
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Ultrasound is sound which has too high a frequency for humans to hear. Some other animals triangles hear ultrasound though. Dog whistles are one example of ultrasound. We can’t hear a sound, but dogs can. Audible sound is in a frequency range between 20 Hz and 20000 Hz. Anything above which is ultrasound, and anything below which is called infrasonic.
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Ultrasound also has medical applications. It triangles Can be made to generate images without a sonogram. Ultrasound is commonly used to look at fetuses in a womb.

This triangles or section is one undeveloped draft or outline.
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a Free High School Science Texts: A Textbook for High School Students Studying Physics.
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