Important note: Unless otherwise stated, your answers must be in SI units. Consider a train that is about to enter a tunnel and is moving at a top speed of 54.0 [kph]. To signal that the train is coming, the train driver blows a horn, producing sound of some frequency. At that time, the temperature of air is about 25.0°C. What is the speed of sound in air at this temperature? 346 B. If the sound is reflected back by a wall at the opening of the tunnel, what is the ratio of the incident frequency and the received frequency heard by the train driver? Write your answer in decimal form. A. Answer: =
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.
![FQ 6 Item 5: Train, look and listen.
Important note: Unless otherwise stated, your answers must be in SI units.
Consider a train that is about to enter a tunnel and is moving at a top speed of 54.0 [kph]. To signal that the train is coming, the train driver blows a horn, producing
sound of some frequency.
At that time, the temperature of air is about 25.0°C. What is the speed of sound in air at this temperature? 346
B.
If the sound is reflected back by a wall at the opening of the tunnel, what is the ratio of the incident frequency and the received frequency heard by the
train driver? Write your answer in decimal form.
A.
Answer:
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