Doppler Effect : The apparent change in the pitch of a note due to the relative motion of the source of sound and the observer.

- The expression for the apparent frequency is derived following n.c.e.r.t. guidelines.
- We consider the general case when both the source and the observer are moving with non-zero velocities.
- First, we determine the time in which the observer receives n-waves, which gives the apparent time period
- The reciprocal of apparent time period gives the apparent frequency.

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