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You dip your finger into a pan of water twice each second, producing waves with crests...

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romanzolanski | Student, Grade 11 | eNotes Newbie

Posted April 12, 2012 at 12:49 AM via web

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You dip your finger into a pan of water twice each second, producing waves with crests that are separated by 0.19 m

You dip your finger into a pan of water twice each second, producing waves with crests that are separated by 0.19 m.

  (a) Determine the frequency of the water waves.
            Hz
(b) Determine the period of the water waves.
            s
(c) Determine the speed of the water waves.              m/s

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thilina-g | College Teacher | (Level 1) Educator

Posted April 29, 2012 at 2:45 PM (Answer #1)

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a) The frequency of the waves are = 2 Hz (since you are making two pulses every second)

b)The period of the waves is 0.19 m (as the consecutive crests are separated by 0.19 m)

c) V = L x f

v = 0.19 m x 2 S-1 (Hz is actually per second)

v = 0.38 ms-1

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gracious15 | Student, Grade 11 | Salutatorian

Posted April 12, 2012 at 1:07 AM (Answer #2)

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I am in 9th grade an I think I can answer this. The answer for both frequency and wavelength:
f = 2 Hz
lambda = 0.19 m

Multiply together to get speed:
v = lambda*f
v = 0.38 meters/second

Reciprocal the frequency to get the period, as per definition, T = 1/f:
T = 0.5 seconds

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