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Husker70
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Homework Statement
A tuning fork generates sound waves with a frequency of 246Hz. The waves travel in
opposite directions along hallway, are reflected by end walls, and return. The hallway
is 47.0m long and the tuning fork is located 14.0m from one end. What is the phase
difference between the reflected waves when they meet at the tuning fork? The speed of
sound in air is 343 m/s.
Homework Equations
delta r = Phi/2pie x Lambda
f = v/Lambda
The Attempt at a Solution
The first thing I did was delta r = r2 - r1 = (33.0m - 14.0m) = 19.0m
then f = v/Lambda or Lambda = v/f = 343m/s / 246Hz = 1.39 units?
using delta r = Phi/2pie x Lambda
19.0m = Phi/2pie x 1.39
I get like 86.5 degrees and it should be 91.3 degrees
Any help would be appriciated.
Kevin