Physics
14.08.2021 15:14
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(I) A hiker determines the length of a lake by listening for the echo of her shout
(I) A hiker determines the length of a lake by listening for the echo of her shout reflected by a cliff at the far end of the lake. She hears the echo 2.5 s after shouting. Estimate the length of the lake.
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smmailloux2335
4,6(6 marks)
425 m
Explanation:
From the question,
v = 2x/t Equation 1
Where v = speed of sound in air, x = Length of the lake, t = time.
make x the subject of the equation
x = vt/2 Equation 2
Given: t = 2.5 s
Constant: v = 340 m/s.
Substitute these values into equation 2
x = 340(2.5)/2
x = 425 m.
Hence the length of the lake is 425 m
darknessmidnight207
4,4(41 marks)
107 - 19 = 88
88/2 = 44 quarts
88/2 = 44 quarts
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