A medical ultrasound transducer emits a sound wave of frequency 2.5 MHz. This wave travels from the coupling gel (where the speed of sound is 1500 m s-1) into a layer of cortical bone (where the speed of sound is 4080 m s-1).
What are the frequency and wavelength of this ultrasound wave as it propagates through the cortical bone?
Frequency =2.5 MHz= 2.5\text{ MHz}=2.5 MHz, Wavelength =1.63 mm= 1.63\text{ mm}=1.63 mm
Frequency =2.5 MHz= 2.5\text{ MHz}=2.5 MHz, Wavelength =0.60 mm= 0.60\text{ mm}=0.60 mm
Frequency =6.8 MHz= 6.8\text{ MHz}=6.8 MHz, Wavelength =0.60 mm= 0.60\text{ mm}=0.60 mm
Frequency =6.8 MHz= 6.8\text{ MHz}=6.8 MHz, Wavelength =1.63 mm= 1.63\text{ mm}=1.63 mm
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.