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The phase difference in simple harmonic motion is the difference in position between two oscillating objects.

In simple harmonic motion, two objects oscillate with the same frequency but may have different starting positions. The phase difference is the difference in position between the two objects at any given time. It is measured in radians or degrees and can be positive, negative, or zero.

The phase difference can affect the interference pattern of waves. When two waves with the same frequency and amplitude meet, they can either reinforce each other (constructive interference) or cancel each other out (destructive interference). The phase difference determines whether the waves will interfere constructively or destructively.

The phase difference can also be used to calculate the time delay between two oscillating objects. If the phase difference is known, the time delay can be calculated using the formula t = (Δφ/2π) x (1/f), where t is the time delay, Δφ is the phase difference, f is the frequency of oscillation.

In summary, the phase difference in simple harmonic motion is the difference in position between two oscillating objects and can affect interference patterns and be used to calculate time delays.

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