Physics equations/17-Physics of Hearing/Q:echoAndstring

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A
{The temperature is -2 degrees Celsius, and you are standing 0.88 km from a cliff. What is the echo time? -a) 4.238 x 100 seconds -b) 4.576 x 100 seconds -c) 4.941 x 100 seconds +d) 5.335 x 100 seconds -e) 5.761 x 100 seconds
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{While standing 0.88 km from a cliff, you measure the echo time to be 5.069 seconds. What is the temperature? +a) 2.72 x 101Celsius -b) 3.15 x 101Celsius -c) 3.63 x 101Celsius -d) 4.19 x 101Celsius -e) 4.84 x 101Celsius
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{What is the speed of a transverse wave on a string if the string is 1.11 m long, clamped at both ends, and harmonic number 4 has a frequency of 611 Hz? -a) 1.57 x 102 unit -b) 1.91 x 102 unit -c) 2.31 x 102 unit -d) 2.8 x 102 unit +e) 3.39 x 102 unit
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