A train sounds a horn that vibrates at a frequency of 400Hz, as heard by the engineer aboard the train. What frequency does a passenger in a car hear for each of the following situations described? Speed of sound in air is 340m/s. All speeds are with respect to the ground. A. A car travels at a speed of 40m/s and is ahead of the moving train. Train moves at 20 m/s in the same direction as the car. B. The car travels at a speed of 40m/s and is behind the moving train but catching up. The train moves at 20m/s in the same direction as the car. C. The car travels at a speed of 40m/s in the opposite direction as the train and moves towards it. The train moves at 20m/s towards the car. D. The cara and the train have passed each other, going in opposite directions. The car travels at 40m/s and the train travels at 20 m/s, both moving away from each other. Thank you!
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 train sounds a horn that vibrates at a frequency of 400Hz, as heard by the engineer aboard the train. What frequency does a passenger in a car hear for each of the following situations described? Speed of sound in air is 340m/s. All speeds are with respect to the ground.
A. A car travels at a speed of 40m/s and is ahead of the moving train. Train moves at 20 m/s in the same direction as the car.
B. The car travels at a speed of 40m/s and is behind the moving train but catching up. The train moves at 20m/s in the same direction as the car.
C. The car travels at a speed of 40m/s in the opposite direction as the train and moves towards it. The train moves at 20m/s towards the car.
D. The cara and the train have passed each other, going in opposite directions. The car travels at 40m/s and the train travels at 20 m/s, both moving away from each other.
Thank you!
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