Sound from generators outside a parked van can be heard inside the van. The sound enters the van through a metal side panel.
One generator produces a sound with a frequency of 120 Hz.
State the frequency of the sound heard inside the van. Give a reason for your answer.
Two other generators, A and B, are tested one at a time. The table shows the vibration amplitude of the panel for each generator.
| Generator | Panel vibration amplitude in μm\mu\text{m}μm |
|---|---|
| A | 12 |
| B | 30 |
Explain which generator produces the sound with the greater intensity inside the van. Use data from the table in your answer.
112 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.