(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 described as A electromagnetic B infrasound C supersonic D ultrasound (ii) State the value of the minimum frequency for ultrasound. 20 000 Hz (iii) Suggest why humans are unable to hear the waves used by the elephants. (b) Complete the sentence by putting a cross (×) in the box next to your answer. When earthquake waves in a solid reach the boundary between the solid and a liquid, A P-waves cannot reflect at the boundary B P-waves cannot refract at the boundary C S-waves cannot reflect at the boundary D S-waves cannot refract at the boundary

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(a) Elephants communicate using waves of frequency 10 Hz - Edexcel - GCSE Physics - Question 6 - 2017 - Paper 1

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(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 descri... 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. This is because elephants do not communicate using electromagnetic waves of frequency 10 Hz.

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 lower than the range of human hearing, which is typically between 20 Hz and 20 kHz.

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.

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(a) Elephants communicate using waves of frequency 10 Hz - Edexcel - GCSE Physics - Question 6 - 2017 - Paper 1

Worked Solution & Example Answer:(a) Elephants communicate using waves of frequency 10 Hz - Edexcel - GCSE Physics - Question 6 - 2017 - Paper 1

Complete the sentence by putting a cross (×) in the box next to your answer.

State the value of the minimum frequency for ultrasound.

Suggest why humans are unable to hear the waves used by the elephants.

Complete the sentence by putting a cross (×) in the box next to your answer.

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