Anna uses a device to keep cats away from her garden - Edexcel - GCSE Physics - Question 1 - 2012 - Paper 1
Question 1
Anna uses a device to keep cats away from her garden.
This device emits some ultrasound waves that cats do not like.
(a) Which of these could be the frequency of th... show full transcript
Worked Solution & Example Answer:Anna uses a device to keep cats away from her garden - Edexcel - GCSE Physics - Question 1 - 2012 - Paper 1
Step 1
Which of these could be the frequency of the ultrasound waves?
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Answer
The frequency of the ultrasound waves that could be emitted by the device is A 23 000 Hz. This is because ultrasound is typically above 20 kHz, and 23 000 Hz fits that criterion.
Step 2
State another use for ultrasound waves.
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Answer
Another use for ultrasound waves is in medical scanning, such as for foetal examinations or medical treatment, which can include destroying kidney stones or treating tumours.
