If we only know the exact spectrum of sound an object generates, we can deduce its dimension and/or its shape if it is a(I) thin and long vibrating string.(II) narrow and long open-ended tube.(III) small vibrating membrane.Question 3Select one:A.(I) and (III) onlyB.None of (I), (II) or (III) is correctC.(I) onlyD.(I) and (II) onlyE.(I) and (II) and (III)
Question
If we only know the exact spectrum of sound an object generates, we can deduce its dimension and/or its shape if it is a(I) thin and long vibrating string.(II) narrow and long open-ended tube.(III) small vibrating membrane.Question 3Select one:A.(I) and (III) onlyB.None of (I), (II) or (III) is correctC.(I) onlyD.(I) and (II) onlyE.(I) and (II) and (III)
Solution
The correct answer is D. (I) and (II) only.
Here's why:
(I) A thin and long vibrating string: The spectrum of sound it generates is directly related to its length and tension. By knowing the exact spectrum, we can deduce its length (and therefore its dimension).
(II) A narrow and long open-ended tube: The spectrum of sound it generates is directly related to its length. By knowing the exact spectrum, we can deduce its length (and therefore its dimension).
(III) A small vibrating
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