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# A vibrator causes water ripples to travel across the surface of a tank. The wave...

### Question

A vibrator causes water ripples to travel across the surface of a tank. The wave travels 50cm in 2s and the distance between successive crests is 5cm. Calculate the frequency of the vibrator

A) 5Hz

B) 6Hz

C) 5.2Hz

D) 25Hz

### Explanation:

$$V = \frac{Distance}{time}$$

= $$\frac{50cm}{2s}$$

= 25 cms$$^{-1}$$.

$$V = f \lambda$$

$$f = \frac{V}{\lambda}$$

$$f = \frac{25}{5}$$

= 5 Hz

## Dicussion (1)

• $$V = \frac{Distance}{time}$$

= $$\frac{50cm}{2s}$$

= 25 cms$$^{-1}$$.

$$V = f \lambda$$

$$f = \frac{V}{\lambda}$$

$$f = \frac{25}{5}$$

= 5 Hz