- #1
songoku
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Homework Statement
A block with a speaker bolted to right side of it is put on the table. The left side of the block is connected to a spring having spring constant k and the block is free to oscillate in horizontal direction. The total mass of the block and speaker is m, and the amplitude of this unit's motion is A. The speaker emits sound waves of frequency f and speed of sound is v
a. Determine the highest frequency heard by the person
b. Determine the lowest frequency heard by the person
c. If the maximum sound level heard by the person is β when the speaker is at its closest distance d from him, what is the minimum sound level heard by the person?
Homework Equations
maybe:
Doppler
T = 2π √(m/k)
The Attempt at a Solution
a. The highest frequency is when the speaker is the closest to the person. I am thinking using Doppler to find the frequency:
[tex]f_2=\frac{v±v_o}{v±v_s}f_1[/tex]
But the speed of the speaker is not constant so I don't think Doppler can be used.
The maximum speed is Aω = A√(k/m), but I am stuck...
b. Don't know