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A stationary radiating system consists of a linear chain of parallel oscillators separated by a distance `d`, with the oscillation phase varting linearly along the chain. Find the time oscillators at which the principle radiation maximum of the system will be ''scanning'' the surroundings with the constant angular velocity `omega`.

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If `Delta varphi` is the phase difference between neighbouring radiators then for a maximum in the direction `theta` we must have
`(2pi)/(lambda)d cos theta + Delta varphi = 2pik`
For scanning `theta = omega t + beta`
Thus `(d)/(lambda) cos (omegat + beta) + (Delta varphi)/(2pi) = k`
or `Delta varphi = 2pi [k - (d)/(lambda) cos (omegat + beta)]`
To get the answer of the book, put `beta = alpha - pi//2`.
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