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A pulse of ultrasound is sent into a person from an ultrasound source at the surface of the skin. Ultrasound travels at 1500 m / s inside human bodies. A reflection arrives back at the surface of the skin after 8.0 × 10 −5 s. Calculate the depth below the surface at which the reflection was caused. depth = m (iii)
See it on the paper →The scientist hears a loud sound of frequency 25 Hz. Calculate the speed of this sound in air. speed = m / s The sound has a wavelength of 14 m.
See it on the paper →The scientist hears a loud sound of frequency 25 Hz. Calculate the speed of this sound in air. speed = m / s The sound has a wavelength of 14 m.
See it on the paper →Sound travels at different speeds in solids, liquids and gases. Identify the state of matter in which sound travels: the slowest
See it on the paper →A transmitted ultrasound wave travels through the metal of the spring and is reflected by a crack as shown in Fig. 6.2. ultrasound emitter and detector transmitted wave reflected wave distance to crack spring crack Fig. 6.2 The reflected wave is detected after the transmitted wave is sent, as shown in Fig. 6.3. transmi...
See it on the paper →Describe how the scientist could measure the speed of sound. Include the measurements that need to be taken.
See it on the paper →Candidates who selected the correct equation for speed successfully completed the calculation. However, some tried to use the speed = distance / time equation without success.
— Examiner report, May/June 2025, 0654/32 Q10(a)(ii) (Cambridge)
Candidates who selected the correct equation for speed successfully completed the calculation. However, some tried to use the speed = distance / time equation without success.
— Examiner report, May/June 2025, 0654/33 Q10(a)(ii) (Cambridge)
Many candidates gained at least two marks. The marking point frequently missed was to make a loud sound.
— Examiner report, February/March 2024, 0654/32 Q9(d) (Cambridge)
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Draw one line from each material to show the average speed of sound in that material. air 340 m / s rock 1500 m / s water 4200 m / s
High frequency sound waves are called ultrasound. An ultrasound wave travels 13.5 cm in 0.000 090 s through water. Calculate the speed of the ultrasound wave in m / s. speed = m / s
See it on the paper →What is the difference in time for sound to travel from P to Q by the two routes?
See it on the paper →Using this information, what value can be determined for the speed of sound?
See it on the paper →Explain why the photographer sees the lightning before he hears the thunder.
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