A police car initially at rest emits a siren with frequency 1000 Hz. A criminal car is moving toward the police car with velocity of 33 ms-1 a) Calculate the apparent frequency heard by the observer in criminal car. b) If the criminal car is now moving away from the police car, calculate the apparent frequency. c) The criminal car is now in stationary position. The police car is moving toward the criminal car with velocity 33 ms-1 . Calculate the apparent frequency heard by the observer in the criminal car. d) If police car is moving away with velocity 33 ms-1 from stationary criminal car, calculate the apparent frequency heard by the observer in the criminal car
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.
A police car initially at rest emits a siren with frequency 1000 Hz. A criminal car is moving toward the police car with velocity of 33 ms-1
a) Calculate the apparent frequency heard by the observer in criminal car.
b) If the criminal car is now moving away from the police car, calculate the apparent frequency.
c) The criminal car is now in stationary position. The police car is moving toward the criminal car with velocity 33 ms-1 . Calculate the apparent frequency heard by the observer in the criminal car.
d) If police car is moving away with velocity 33 ms-1 from stationary criminal car, calculate the apparent frequency heard by the observer in the criminal car
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