A student investigates how well a wooden partition insulates against different frequencies of sound. They measure the transmitted sound level in decibels (dB) for several frequencies.
| Frequency (Hz) | Transmitted Sound Level (dB) |
|---|---|
| 125 | 72 |
| 250 | 65 |
| 500 | 58 |
| 1000 | 38 |
| 2000 | 45 |
| 4000 | 52 |
State the reason why 1000 Hz is identified as the frequency at which the partition 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.