Difference between beats and interference are:
1. When two sets of waves of nearly equal frequencies and amplitude are superposed it is found that the amplitude of the resultant wave fluctuates with time from maximum to minimum. This phenomenon of fluctuation amplitude is known as beats.
2. The difference of frequencies is almost equal.
3. The phase difference of two waves with respect to time is constant.
4. The resultant amplitude with respect to time is not constant and it is,
5. The resultant frequency is the average of two frequencies.
1. When two sets of waves of the same frequency and same or nearly equal amplitude travelling through the same medium overlap, then it is found that due to superposition, they wholly or partly multiply each other at certain times and places and reinforce each other to produce a greater effect at other time and places. This phenomenon is termed interference.
2. The difference of frequencies is equal.
3. The phase difference of two waves with respect to time is not constant.
4. The resultant amplitude with respect to time is constant and it is
5. The resultant frequency is equal to each of the frequency.