# A vibrator causes water ripples to…frequency of the vibrator

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• A. 5Hz
• B. 6Hz
• C. 5.2Hz
• D. 25Hz

A

## DETAILS…

### Data given:

Distance travelled by wave = 50cm

Time of travel = 2s

Distance between two successive crests = wavelength = 5cm

Frequency of vibrator = ?

Speed of the wave can be directly calculated as:

Speed = distance/time = 50cm/2s = 25cm/s

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Now, velocity of a wave = frequency X wavelength

Hence, frequency = velocity/wavelength = 25/5 = 5Hz

### Now for the right answer to the above question:

1. Option A is correct.
2. Option B is incorrect.
3. C is incorrect.
4. D is not the correct answer.

## KEY-POINTS…

You may please note these/this:

• No need to convert the distance from cm to m, this is because the wavelength too is given in cm.
• Consistency in unit is very important here, if you convert the distance from cm to m, you would have to also do the same for the wavelength in order to maintain balance but doing this would be a waste of precious time.

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