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09/01/2021 5:03 pm
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A sound produces 13 crests and 15 troughs in 3 seconds. When the second crest is produced the first is 2 cm away from the source? Calculate.
(a) the wavelength
(b) the frequency
(c) the wave speed.
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09/01/2021 5:07 pm
(a) Wavelength = distance between two consecutive crests or troughs is 2 cm.
(b) Frequency = \(\frac{Number\;of\;troughs}{Time}\) = \(\frac{15}{3}\) = 5 Hz
(c) Wave speed = \(\frac{Distance}{Time}\)
Distance travelled by wave = 15 x 2 = 30 cm
Time = 3 seconds
Wave speed = \(\frac{30}{3}\) = 10 cm/s