The equation of a longitudinal wave is represented as \[y=20\cos \pi ( – McqOptions

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1.	The equation of a longitudinal wave is represented as \[y=20\cos \pi (50t-x)\]. Its wavelength is [UPSEAT 2001; Orissa PMT 2004]
A.	5 cm
B.	2 cm
C.	50 cm
D.	20 cm
Answer» C. 50 cm

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