Displacement of a wave is expressed as x ( t ) = 5 cos ( 628 t + 2 π ) m . The wavelength of the wave when its velocity is 300 m / s is :

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Displacement of a wave is expressed as x ( t ) = 5 cos ( 628 t + 2 π ​ ) m . The wavelength of the wave when its velocity is 300 m / s is :

TestHub · Accepted Answer

​ x ( t ) = 5 cos [ 628 t + 2 π ​ ] m velocity ( v ω ​ ) = 300 m / s v w ​ = K ω ​ 300 = K 628 ​ ⇒ K = 300 628 ​ λ 2 π ​ = 300 628 ​ ⇒ λ = 628 2 × 3.14 × 300 ​ λ = 2 m ​

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