A wave has frequency 4 Hz and wavelength 2 m. Set the slider to its speed, using $v = f\lambda$ .

Estimate on a scale from 0 m/s (0) to 20 m/s (20).

Hints

Four crests pass per second, each 2 m apart.
$v = 4 \times 2$ .

Show the answer

8 (answers within ±0.5 count)

Why

$v = 8$ m/s: crest spacing times crests-per-second is distance-per-second. This identity holds for every wave in nature — sound, light, ripples — because it is really just bookkeeping of crests.

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A wave has frequency 4 Hz and wavelength 2 m. Set the slider to its speed, using v=fλv = f\lambdav=fλ.

Practise Wave Properties and the Wave Equation

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A wave has frequency 4 Hz and wavelength 2 m. Set the slider to its speed, using $v = f\lambda$ .