The newest 6 of 6 written questions. Open one to see it on the real paper.
State what is meant by ultrasound. (iii) Elephants communicate using infrasound. Infrasound waves are sound waves with a frequency below the lower limit of frequencies audible to humans. Suggest a frequency for infrasound waves. Explain your answer. infrasound frequency = .. Hz EOXPlAMALION
See it on the paper →Ultrasound is a longitudinal wave. State the lowest frequency of ultrasound and include the unit.
See it on the paper →Suggest the frequency of ultrasound waves in kHz. Use your knowledge of the range of frequencies audible to humans to explain your answer. frequency = kHz explanation
See it on the paper →Ultrasound waves can be used to produce images of unborn babies inside the human body, as shown in Fig. 10.2. skin ultrasound source and detector (ii) unborn baby Fig. 10.2 State the lowest frequency of ultrasound waves.
See it on the paper →The frequency of the ultrasound waves is above the audible range of a healthy human ear. Suggest a frequency for ultrasound waves. frequency = Hz
See it on the paper →Suggest a frequency for ultrasound waves. State the unit of your answer. frequency = unit
See it on the paper →Many candidates were able to suggest a frequency for ultrasound waves. Any value above 20 000 was accepted. Most candidates were able to state the unit of frequency as Hertz / Hz.
— Examiner report, February/March 2021, 0654/32 Q3(c)(ii) (Cambridge)
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