Because of the Doppler effect, the sound heard by an observer listening to a moving ambulance siren, compared to what the observer would have heard if the observer and siren were both at rest... will have a lower pitch if the ambulance siren is moving towards the observer. will have a longer wavelength if the ambulance siren is moving towards the observer. will have a lower frequency if the ambulance siren is moving towards the observer will have a higher frequency if the ambulance siren is moving away from the observer. will have a higher frequency if the ambulance siren is moving towards the observer
Properties of sound
A sound wave is a mechanical wave (or mechanical vibration) that transit through media such as gas (air), liquid (water), and solid (wood).
Quality Of Sound
A sound or a sound wave is defined as the energy produced due to the vibrations of particles in a medium. When any medium produces a disturbance or vibrations, it causes a movement in the air particles which produces sound waves. Molecules in the air vibrate about a certain average position and create compressions and rarefactions. This is called pitch which is defined as the frequency of sound. The frequency is defined as the number of oscillations in pressure per second.
Categories of Sound Wave
People perceive sound in different ways, like a medico student takes sound as vibration produced by objects reaching the human eardrum. A physicist perceives sound as vibration produced by an object, which produces disturbances in nearby air molecules that travel further. Both of them describe it as vibration generated by an object, the difference is one talks about how it is received and other deals with how it travels and propagates across various mediums.
Because of the Doppler effect, the sound heard by an observer listening to a moving ambulance siren, compared to what the observer would have heard if the observer and siren were both at rest...
| will have a lower pitch if the ambulance siren is moving towards the observer. |
| will have a longer wavelength if the ambulance siren is moving towards the observer. |
| will have a lower frequency if the ambulance siren is moving towards the observer |
| will have a higher frequency if the ambulance siren is moving away from the observer. |
| will have a higher frequency if the ambulance siren is moving towards the observer. |
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