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Dimuthu · Answer 1 · 2019-12-28T11:46:11+0000

The speed of a wave is related to its frequency and its wavelength by

$v=f \lambda$
where f is the frequency and
$\lambda$ the wavelength. In our problem,
f=0.40 Hz

and
$\lambda=420 m$ , therefore the speed of the wave is:

$v=f \lambda=(0.40 Hz)(420 m)=168 m/s$

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