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Is Matter Around Us Pure

Question
CBSEENSC9006581
Wired Faculty App

Find the velocity of the wave shown in the figure below.




Solution
Distance between two successive crests is λ, therefore
λ = 2.5 m
Now a wave travels a distance equal to wavelength in one time period.
Therefore, time-period is 
straight T space equals space 4.5 space minus space 2.5 space equals space 2 space ms space equals space 2 space cross times space 10 to the power of negative 3 end exponent straight s Velocity space of space wave comma space v space equals space straight lambda over straight T space equals space fraction numerator 2.5 over denominator 2 space cross times space 10 to the power of negative 3 end exponent end fraction space equals space 1250 space straight m divided by straight s.

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