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The equation of a plane progressive wave...

The equation of a plane progressive wave is given by
`y=2cos(100pit-(pix)/(20))`
where x and y are in cm and t is in second. The wavelength of the wave is

A

20 cm

B

100 cm

C

40 cm

D

`(pi)/(20)` cm

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The correct Answer is:
C
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