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Submarines use ultrasound waves during underwater navigation. Suggest a frequency in Hz of the ultrasound waves used. frequency = . . Hz
See it on the paper →State what happens to the amplitude of the sound waves.
See it on the paper →State what happens to the pitch of the sound.
See it on the paper →The audible frequency range for a horse is from 55 Hz to 33 kHz. Compare this range to that of a human.
See it on the paper →State the minimum frequency audible to humans. minimum frequency = Hz
See it on the paper →State the minimum frequency audible to humans. minimum frequency = Hz
See it on the paper →The polar bear jumps into a pool of water and makes water waves. Fig. 10.1 shows a wave. Y Z distance from source of wave Fig. 10.1 amplitude trough frequency wave speed pitch wavelength Y shows the of the wave. Choose words from the list to identify Y and Z by completing the two sentences.
See it on the paper →State which animal in Table 11.1 has the smallest audible frequency range.
See it on the paper →State the approximate range of frequencies audible to humans. from Hz to Hz
See it on the paper →State the frequency range of human hearing.
See it on the paper →Ultrasound waves have a frequency that is too high for a human to hear. Use your knowledge of the range of audible frequencies for a human to suggest the frequency of ultrasound waves. frequency = Hz
See it on the paper →Ultrasound waves are used to scan unborn babies. Ultrasound waves have a frequency above the maximum audible frequency for a human. Suggest a frequency for ultrasound waves. State the unit of your answer. frequency = unit
See it on the paper →The penguin hears a sound of 400 Hz made by the scientist. The audible frequency range for the penguin has a higher minimum frequency and a lower maximum frequency compared to a human. Suggest the audible frequency range for the penguin. minimum frequency = Hz maximum frequency = Hz
See it on the paper →Explain why a human cannot hear the sound emitted by the bat.
See it on the paper →The bat changes the frequency of the sound it produces from 200 kHz to 250 kHz. State what happens to the pitch of the sound.
See it on the paper →A dolphin changes the frequency of a sound it makes from 1000 Hz to 2000 Hz. State what happens to the pitch of the sound.
See it on the paper →The tumble dryer is noisy and emits loud sound waves with a low pitch. Describe the sound waves in terms of their amplitude and frequency. amplitude
See it on the paper →State the lowest audible frequency for a healthy human ear. State the unit of your answer. frequency = unit
See it on the paper →Which row gives the properties of a sound wave that affect the pitch and the loudness of a sound?
See it on the paper →row gives the properties of a sound wave that affect the pitch and the loudness of a sound?
See it on the paper →Comprehensive responses • A few candidates were able to suggest a frequency for the ultrasound waves. Limited responses • Few candidates were able to link ultrasound to the approximate range of frequencies audible to humans.
— Examiner report, February/March 2026, 0654/32 Q10(c) (Cambridge)
Many candidates knew the appropriate range for a human and were able to make a comparison. Others were too vague in their comparison, often not being clear in their references to horses or humans. Others referred to better hearing which was not the correct idea.
— Examiner report, May/June 2025, 0654/31 Q9(b) (Cambridge)
This question was well answered. Some candidates mistakenly gave the upper range and others were clearly guessing.
— Examiner report, May/June 2025, 0654/32 Q10(a)(i) (Cambridge)
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