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Anna was on vacation and came across an
echo lake. Wanting to know how far she had
to swim to get across the lake to the other
side, she yelled across “Hello!”
How wide is the lake if 4 seconds later she
heard her own echo? Assume that the tem-
perature is 20◦C and the speed of sound is
344 m/s. Answer in units of m.
At 20 °C is ρ20 = 1.204 kg/m3, Z20 = 413 N·s/m3, and c20 = 343 m/s
So, using 343 m/s because of the air temperature of 20 degrees:
343 * 4 = 1372
So, the lake is 1372 m.
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