An acoustics engineer measures the performance of a prototype polymer foam panel designed to damp industrial noise. A constant-intensity sound source is placed on one side of the panel, and the sound pressure level transmitted through the panel is recorded on the other side at various frequencies.
| Frequency (Hz) | Transmitted Sound Level (dB) |
|---|---|
| 250 | 74 |
| 500 | 62 |
| 1000 | 51 |
| 2000 | 43 |
| 4000 | 29 |
| 8000 | 38 |
State the reason why 4000 Hz is identified as the frequency at which the polymer foam panel is the most effective sound insulator.
35 exam-style questions on Edexcel GCSE Physics 4.3 Sound, ultrasound and infrasound, covering 4.3.1 Sound waves, vibrations and the human ear, 4.3.2 Ultrasound and infrasound, 4.3.3 Uses of ultrasound and infrasound, and 4.3.4 Sound waves passing between media. Each one has a worked solution and a mark scheme showing where the marks go.