An ultrasound probe produces ultrasound with a frequency of 2.0 MHz.
The ultrasound passes from soft tissue into bone.
The Table shows the speed of ultrasound in each material.
Table
| Material | Speed of ultrasound in m/s\text{m/s}m/s |
|---|---|
| soft tissue | 1540 |
| bone | 4080 |
Calculate the wavelength of the ultrasound in the soft tissue.
Calculate the increase in the wavelength of the ultrasound when it passes from the soft tissue into the bone.
Explain why the frequency of the ultrasound does not change when it passes from the soft tissue into the bone.
A student says:
'The ultrasound could become audible sound in the bone because its wavelength gets longer.'
Explain why the student is wrong.
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.