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**[SOLVED] Wave problem**

## Homework Statement

a small stone fell into alake causing 40 waves after 4 seconeds, if the radius of the outter circle is 1.6 meters, find the length of the occurred wave and its velocity

## Homework Equations

## The Attempt at a Solution

well i got two different solutions so far cause i couldn't determine what exactly was meant by (r=1.6m & length of the occurred wave):

1- f = 10 Hz

lambda/4 = 1.6

lambda = 6.4 m

v = lambda.f

= 6.4 × 10

= 64 m/s

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2- v = x/t

x = 2pi.r

= 10 m

v = 10/4

= 2.5 m/s (oO)