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  The weird music of Sarah and Ali - $5 Physics quiz

  The weird music of Sarah and Ali - $5 Physics quiz
   
  
  Along with her musical team band, Sarah wants to become a famous and worldwide selling artist. She is incredibly passionate about musical instruments, particularly in the acoustic guitar. Aside...

  • July 13, 2021

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    Farjana Lima For answering this question, at first we have to know how guitars work. There are various styles of guitars all which have different sounds and their unique sound comes from the materials of the strings and the composition of the bodies and also the air...  moreFor answering this question, at first we have to know how guitars work. There are various styles of guitars all which have different sounds and their unique sound comes from the materials of the strings and the composition of the bodies and also the air between them. There are six strings on a guitar each with an open notes of E2, A2,D3,G3, B3 and E4 and their corresponding frequences are 82 Hz, 110Hz, 147Hz, 196Hz, 247Hz,330Hz. These frequences represent the root tone of each string. So, when you play guitar, these strings transfer their sound into the body of the guitar where they set up an internal resonance on the air Chamber made by the body and cause the back plate and face plate to vibrate. And these vibration cause the air to compress and we hear the compression waves in the air as sound. So, this is how guitar works.
    For this reason, when sarah and Ali attemted sychronously to play acoustic guitar the same voicings , it created a moment of loud thumping noices.  less

    • July 12, 2021
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    Farjana Lima So, if sarah and Ali want to avoid this problem, they have to create some distance sonically between their acoustic guitars or they have to play different chord or different parts namely rhythm and leads while playing together.

    • July 12, 2021
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    Noorjahan Binte Farhana That is all about the noise vibration.
    Hearing range refers to the frequency of hearing that the senses of human and other animals are able to hear. Human hearing ranges from 20 Hz to 20,000 Hz frequency, but varies greatly from person to person. So...  moreThat is all about the noise vibration.
    Hearing range refers to the frequency of hearing that the senses of human and other animals are able to hear. Human hearing ranges from 20 Hz to 20,000 Hz frequency, but varies greatly from person to person. So when the acoustic guitar cross out the noise frequency and it's unable to our ear it creates a moment of loud thumping noise.  

    • July 13, 2021
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    Shadman Chowdhury When they were playing guitar, a loud thumping noise was produced due to the vibration of their playing, it caused some sort of interference. This would explain why when they are playing at the same time, there was an odd but clear sound that they were...  moreWhen they were playing guitar, a loud thumping noise was produced due to the vibration of their playing, it caused some sort of interference. This would explain why when they are playing at the same time, there was an odd but clear sound that they were not supposed to produce.
    
    The reason for this is because whenever any objects vibrate or moves, it produces interference. When one object moves in a particular direction or changes its motion suddenly, there will be waves forming in all directions. If another object has these waves hitting them as well while moving around by itself then there will be interference which will result in having waves being lost or changed.
    
    The concept of physics used is applied in the principle of interference. When two or more objects cause vibration or motion, there will be waves colliding with each other and either being canceled out or changed by a small fraction. This is an example of interference that can lead to many different problems down the road.  less

    • July 13, 2021
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    Zarin sadaf snigdha To answer this question we need to look at the principle of superposition of waves which states when 2 or more waves meet at a point the displacement or amplitude is equal to the vector summation of the amplitude of the individual waves. Here when they...  moreTo answer this question we need to look at the principle of superposition of waves which states when 2 or more waves meet at a point the displacement or amplitude is equal to the vector summation of the amplitude of the individual waves. Here when they both play the guitar simultaneously both of them produce waves of similar Frequency. These waves are produced interact with eachother & produce constructive & destructive superposition. This leads to amplitude at a few points to become double as displacement at that point is high. This leads to the loud noise as high amplitude is responsible for high sound. To avoid this they need to play different cords or change the frequency of the waves produced.  less

    • July 13, 2021
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    Tanveer Tausif Ratul The above phenomena is related to the terms-Interference and Superposition.When Sarah & Ali attempted to play
    the acoustic guitar synchronously,two sound waves were generated from two guiters at the exact same time.I mean each one produced the same...  moreThe above phenomena is related to the terms-Interference and Superposition.When Sarah & Ali attempted to play
    the acoustic guitar synchronously,two sound waves were generated from two guiters at the exact same time.I mean each one produced the same sound wave and both the waves were in same phase.Now,what is phase!
    
    
    If two waves have the same amplitude,same frequency and same wavelength,then it is said that both the waves are in same phase.
    
    
    So when two or more same-phased
    waves arrive at the same point (when both started playing their guitar),the waves superimpose themselves on one another.Actually the amplitudes of the wave superimpose.This term is known as-Superposition.So,the resultant wave will simply be the addition of the amplitudes of the individual waves.This superposition
    produces Constructive Interference which produces a wave that has twice the amplitude of the individual waves.The higher the amplitude,the louder the sound
    will be.
    
    
    On the other hand,it can be said very easily...    less

    • July 14, 2021
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    Tanveer Tausif Ratul that,when two waves are in opposite phase (their amplitude direction is opposite) & the superimpose on
    each other,the resulting amplitude is zero which is known as-Destructive Interference.It means the two waves cancel each other.Therefore,no sound will...  morethat,when two waves are in opposite phase (their amplitude direction is opposite) & the superimpose on
    each other,the resulting amplitude is zero which is known as-Destructive Interference.It means the two waves cancel each other.Therefore,no sound will be produced.
    
    From this discussion,it has been realized that when Sarah & Ali started playing at the same time,the sound waves generated from their instrument superimposed on each other and created the wave which had twice the amplitude of that individual wave.So a loud thumping noise was
    generated.But their ear were get used to it slowly.So,it didn’t affect that much later  less

    • July 14, 2021
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    Hasnain Tariq actually this happens due to resonance frequency . this is the frequency where superposition of waves can generate. same happen in the case of Sarah and Ali frequency of both musical instrument match suddenly this create loud thumping noise.

    • July 14, 2021