1.

The phase difference between two waves, represented byy _(1) = 10 ^(-65) sin [100 t + (x //50) + 0.5]m y_(2) = 10 ^(-6) cos [100 t + (x //50)]m (where x is expressed in metres and t is expressed in seconds is approximately .....

Answer»

`15` RADIAN
`1.07` radian
`2.07` radian
`0.5` radian

Solution :Here, `y _(1) = 10 ^(-6) SIN (100 t + (x)/( 50) + 0.5) m ""…(1)`
and `y _(2) = 10 ^(-6) cos (100 t + (x)/(50) ) m ""…(2)`
`therefore y _(2) =10 ^(-6) sin ((pi)/(2) + 100 t + (x)/( 50)) ""…(3)`
`{because cos theta = sin ((pi)/(2) +theta)}`
From equation (1), phase of first wave at time t,
`theta _(1) = 100 t + (x)/(50) + 0.5`
From equation (3) phase of second wave at time, t,
`theta_(2) = (pi)/(2) + 100 t + (x)/(50)`
`implies `Phase difference between second and first wave at time t is,
`theta_(2) -theta_(1) = (pi)/(2) =0.5`
`= (3.14)/(2) -0.5`
`= 1.57 -0.5`
`= 1.07 RAD`


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