First slide

Charaterstics of sound

Question

A is singing a note and simultaneously B is singing another note whose frequency is 1/8th that of A. The energy of two notes is the same. The amplitude of B note as compared to that of A note is

Moderate

A

equal
B

two times
C

four times
D

eight times

Solution

$I = 2 π^{2} n^{2} a^{2} ρv = constant or \frac{a_{B}}{a_{A}} = \frac{n_{A}}{n_{B}} = \frac{8 n_{A}}{n_{A}} = 8 or a_{B} = 8 a_{A}$

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