Question
Write the applications of beats.
✓
Answer
Beats are used to:
- Determine an unknown frequency by listening to the beat frequency $\Delta \text{v}.$ Then unknown frequency $\text{v}'=\text{v}+\Delta\text{v}$ where $v$ is known and it is close to the unknown frequency. Exact values of $v$ is found by loading and filling the turning fork of unknown frequency from which $+$ or $-$ sign is chosen;
- Tune musical instruments by sounding them together and reducing beats number to zero.
- Make a sound rich in musical effect by deliberate introduction of beats between different musical instruments.
- To produce very low frequency pulses which otherwise cannot be produced. Beat frequency is the low frequency sound.
- Receive radio programme by superheterodyne method.
- Detect harmful gases in mines.
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