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Lo 2

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Matt Tsuruda

The document describes a scenario where two friends attend a poorly attended concert. They notice the guitarist playing a note at 147 Hz and the bassist playing a note at 135 Hz. They also hear two generators making high pitched noises, one at 614 Hz and the other at 626 Hz. The question is whether the number of beats heard from the musical instruments and generators will be the same in a minute, given that the difference in frequencies is the same, even though the generators have a higher pitch. The solution is that the number of beats heard is determined only by the difference in frequencies, not the actual frequencies. Therefore, the number of beats from the guitar/bass and generators will be the same.

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Physics 101 Learning Object 2 Beat Frequencies at a Concert One night, you and a friend decide to attend a concert. When, you arrive, you find it is not a very popular artist, as you and your friend are the only two people in attendance. The only sounds during the concert are coming from the guitarist, the bassist, and two separate generators in the back of the room making high pitched noises. You soon find out why the band isn’t very popular, as they aren’t very talented, so you turn your attention to something more interesting. You wonder; if the difference in the frequencies of the notes of the guitar and bass, and the two generators, are the same, will the beats you hear in a minute be the same from each? Does it matter that the generators are of a significantly higher pitch than the two musical instruments? Let’s say that in the concert, the guitarist holds his note for a minute at 147 hz, and the bassist holds his note for the same amount of time at 135 hz. At the same time, one generator has a frequency of 614 hz, and the other at 626 hz. you assume that there is no instrument/generator interference. Solution
The number of beats you hear in a given time is only determine by the difference in frequency, not the magnitude of each. Therefore, you would hear the same amount of beats coming from both the guitar and bass, and the two generators. F1 - F2 = Delta F Delta F x Seconds = Number of Beats 147-135 = 12 x 60 = 720 beats 626-614 = 12 x 60 = 720 beats

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Lo 2

  • 1. Physics 101 Learning Object 2 Beat Frequencies at a Concert One night, you and a friend decide to attend a concert. When, you arrive, you find it is not a very popular artist, as you and your friend are the only two people in attendance. The only sounds during the concert are coming from the guitarist, the bassist, and two separate generators in the back of the room making high pitched noises. You soon find out why the band isn’t very popular, as they aren’t very talented, so you turn your attention to something more interesting. You wonder; if the difference in the frequencies of the notes of the guitar and bass, and the two generators, are the same, will the beats you hear in a minute be the same from each? Does it matter that the generators are of a significantly higher pitch than the two musical instruments? Let’s say that in the concert, the guitarist holds his note for a minute at 147 hz, and the bassist holds his note for the same amount of time at 135 hz. At the same time, one generator has a frequency of 614 hz, and the other at 626 hz. you assume that there is no instrument/generator interference. Solution
  • 2. The number of beats you hear in a given time is only determine by the difference in frequency, not the magnitude of each. Therefore, you would hear the same amount of beats coming from both the guitar and bass, and the two generators. F1 - F2 = Delta F Delta F x Seconds = Number of Beats 147-135 = 12 x 60 = 720 beats 626-614 = 12 x 60 = 720 beats