There are two trains (A and B) each with the same whistle that produces a sound wave at 403 Hz. Train A is at the origin and is stationary. An observer is to the right of train A and is moving to the right, away from train A, at 20 m/s. Train B is to the right of the observer and train A. It is moving to the right at 35 m/s, away from both the observer and train A. The temperature is 20 degrees C. What is the beat frequency between whistles A and B as heard by 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.
There are two trains (A and B) each with the same whistle that produces a sound wave at 403 Hz. Train A is at the origin and is stationary. An observer is to the right of train A and is moving to the right, away from train A, at 20 m/s. Train B is to the right of the observer and train A. It is moving to the right at 35 m/s, away from both the observer and train A. The temperature is 20 degrees C.
What is the beat frequency between whistles A and B as heard by the observer?
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