Respuesta :

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v = fλ

v = velocity, f = frequency, λ = wavelength

f = 1/T

f = frequency, T = period

v = fλ = λ/T

Given values:

λ = 4.5m, T = 0.007s

v = 4.5/0.007

v = 643m/s

Round to 2 significant figures:

v = 640m/s

Answer:

v = I ⁄ T  

v= 4.5  ⁄ 0.007  

v = 642.9 m/s

Explanation:

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