Waves Propagate at 6

Multiple Choice

Waves propagate at 6.8 m/s along a stretched string.The end of the string is vibrated up and down once every 2.5 s.What is the wavelength of the waves that travel along the string?
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A) 5 m
B) 17 m
C) 2.7 m
D) 1.9 m
E) 9.6 m