please help with these old physics questions?

The wave number and the angular frequency are 6.2rad/m and 12 rad/s. what could be the equations of the wave?

8sin(6.2x-12t)

8sin(12x-6.2t)

12sin(6.2x-8t)

all  of the above

Find the displacement of the wave y= 12sin(6.28x-3.14t) when x=2m and t=4s

0m

6m

12m

3m

1 Answer

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  • 1 month ago

    1) the equation for a travelling wave is given by

    y= a sin (kx-wt)

    a= amplitude

    k= wave number= 6.2 rad/m

    w=angular frequnecy= 12 rad/s

    so y= 8 sin(6.2x-12t)

    2) y = 12*sin((6.28*2) - (3.14*4))

    y = 12*sin0

    y = 0

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