WAEC - Physics (2000 - No. 23)
A periodic pulse travels a distance of 20.0m in 1.00s. If its frequency is 2.0 x 103Hz. Calculate the wavelength.
1.0 x 10-3m
1.0 x 10-2m
2.0 x 10-2m
1.0 x 102m
Explanation
Given: distance(d) = 20.0m. time(t) = 1secs, f = 2 x 10\(^3\)Hz, wavelength(λ) = ?
But v = \(\frac{s}{t}\) =20.0m/s = fλ
λ = \(\frac{\text{v}}{\text{λ}}\) = \(\frac{20}{2\times10^3}\) = 0.01m = 1.0 x 10\(^{-2}\)m
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