1. | \(6\) | 2. | \(5\) |
3. | \(4\) | 4. | \(3\) |
A source of unknown frequency gives \(4\) beats/s when sounded with a source of known frequency of \(250~\text{Hz}\). The second harmonic of the source of unknown frequency gives five beats per second when sounded with a source of frequency of \(513~\text{Hz}\). The unknown frequency will be:
1. | \(246~\text{Hz}\) | 2. | \(240~\text{Hz}\) |
3. | \(260~\text{Hz}\) | 4. | \(254~\text{Hz}\) |