You see a dear friend that you have not seen in a long time. You both scream a mighty scream of joy and beats at 10 Hz are heard. Both of you continue to scream, but your friend starts running towards you while you remain stationary, and the beat frequency becomes smaller. If your friend’s scream has a frequency of 400 Hz, what is the frequency of your scream? Explain your answer in detail. A) 380 Hz B) 390 Hz C) 400 Hz D) 410 Hz E) 420 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.
You see a dear friend that you have not seen in a long time. You both scream a mighty scream of joy and beats at 10 Hz are heard. Both of you continue to scream, but your friend starts running towards you
while you remain stationary, and the beat frequency becomes smaller. If your friend’s scream has a frequency of 400 Hz, what is the frequency of your scream? Explain your answer in detail.
A) 380 Hz
B) 390 Hz
C) 400 Hz
D) 410 Hz
E) 420 Hz
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