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The displacement y is expressed as a function of x and t in terms of the wave numberk and the angular frequency. Write the equivalent equations in which y is shown as a function of x in terms of (a) kand v, (b) 1 and v(c) and fand (d) f and v.

Answer :

Explanation:

The displacement equation is given by :

(a) [tex]y=A\ sin(\omega t\pm kx)[/tex]

Since, [tex]\omega=2\pi f[/tex]

[tex]\lambda=\dfrac{2\pi}{k}[/tex]

[tex]y=A\ sin(2\pi f t\pm kx)[/tex]

[tex]y=A\ sin(\dfrac{2\pi vt}{2\pi /k}\pm kx)[/tex]

[tex]y=A\ sin(kvt+kx)[/tex]

[tex]y=A\ sink(vt+x)[/tex]

The above equation is in terms of k and v.

(b) [tex]y=A\ sin(\omega t\pm kx)[/tex]

[tex]y=A\ sin(2\pi \dfrac{v}{\lambda}t\pm\dfrac{2\pi}{\lambda}x)[/tex]

[tex]y=Asin\dfrac{2\pi}{\lambda}(vt\pm x)[/tex]

(c) [tex]y=A\ sin(\omega t\pm kx)[/tex]

[tex]y=A\ sin(2\pi f t\pm \dfrac{2\pi}{\lambda} x)[/tex]

[tex]y=A\ sin\ 2\pi (ft\pm \dfrac{x}{\lambda})[/tex]

(d) [tex]y=A\ sin(\omega t\pm kx)[/tex]

[tex]y=A\ sin(2\pi ft+\dfrac{2\pi}{\lambda}x)[/tex]

[tex]y=A\ sin(2\pi ft+\dfrac{2\pi}{v/f}x)[/tex]

[tex]y=A\ sin\ 2\pi f(t+\dfrac{x}{v})[/tex]

Where

k is the propagation constant

v is the speed of wave

f is the frequency of a wave

[tex]\lambda[/tex] is the wavelength

Hence, this is the required solution.

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