(a) Elephants communicate using waves of frequency 10 Hz - Edexcel - GCSE Physics - Question 6 - 2017 - Paper 1
Question 6
(a) Elephants communicate using waves of frequency 10 Hz.
(i) Complete the sentence by putting a cross (✗) in the box next to your answer.
These waves can be descr... show full transcript
Worked Solution & Example Answer:(a) Elephants communicate using waves of frequency 10 Hz - Edexcel - GCSE Physics - Question 6 - 2017 - Paper 1
Step 1
Complete the sentence by putting a cross (✗) in the box next to your answer.
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Answer
The correct answer is B: infrasound. Elephants communicate using infrasound waves, which are low-frequency sound waves below the range of human hearing.
Step 2
State the value of the minimum frequency for ultrasound.
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Answer
The minimum frequency for ultrasound is 20,000 Hz.
Step 3
Suggest why humans are unable to hear the waves used by the elephants.
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Answer
Humans are unable to hear the waves used by elephants because these waves have a frequency that is below the range of human hearing, which typically extends from about 20 Hz to 20,000 Hz. Therefore, infrasound (below 20 Hz) cannot be detected by the human ear.
Step 4
Complete the sentence by putting a cross (✗) in the box next to your answer.
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Answer
The correct answer is A: P-waves cannot reflect at the boundary. P-waves (primary waves) can travel through both solids and liquids, but they do not reflect at the boundary.
