A stationary police car siren emits a frequency of 1600 Hz and the speed of sound propagation in the air is 343 m / s. What frequency will you hear if you are stationary and a police car is moving toward you at a speed of 25 m / s and what is the frequency if the police car is moving away from you at a speed of 25 m / s answer options: A. Frequency when close to 1591 Hz and frequency when away from 1874 Hz B. Frequency when approaching 1876 Hz and frequency when moving away from 1431 Hz C. Frequency when approaching 1726 Hz and frequency when moving away from 1491 Hz D. Frequency when close to 1451 Hz and frequency when away from 1784 Hz
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.
*multiple choice questions*
A stationary police car siren emits a frequency of 1600 Hz and the speed of sound propagation in the air is 343 m / s. What frequency will you hear if you are stationary and a police car is moving toward you at a speed of 25 m / s and what is the frequency if the police car is moving away from you at a speed of 25 m / s
answer options:
A. Frequency when close to 1591 Hz and frequency when away from 1874 Hz
B. Frequency when approaching 1876 Hz and frequency when moving away from 1431 Hz
C. Frequency when approaching 1726 Hz and frequency when moving away from 1491 Hz
D. Frequency when close to 1451 Hz and frequency when away from 1784 Hz
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