A wave travelling on a string at a speed of 10 m/s causes each particle of the string to oscillate with a time period of 20 ms.
(a) What is the wavelength of the wave?
(b) lf the displacement of a particle is 1.5 mm at a certain instant, what will be the displacement of a
particle 10 cm away from it at the same instant?

Question

Saurabh Koranglekar · Answer

Arun · Answer

Given,
Wave speed (v) = 10
Time period (T) =
a) Wavelength of the wave:

= 0.02 m = 20 cm
(b) Displacement of the particle at a certain instant:
y =
1.5 =
Phase difference of the particle at a distance x = 10 cm:

The displacement is given by

= = 1.5 mm
Hence, Displacement = 1.5 mm

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