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10 (a) The human ear can only detect frequencies below ultrasound and above infrasound - Edexcel - GCSE Physics - Question 10 - 2022 - Paper 1
Question 10
10 (a) The human ear can only detect frequencies below ultrasound and above infrasound. (i) Which of these gives the approximate range of frequencies for the human ... show full transcript
Worked Solution & Example Answer:10 (a) The human ear can only detect frequencies below ultrasound and above infrasound - Edexcel - GCSE Physics - Question 10 - 2022 - Paper 1
Step 1
Step 2
Suggest two reasons why there are limits to the frequencies that a human ear can detect.
Answer
- The structures of the ear can only respond to certain frequencies; high-frequency sounds may not induce the necessary vibrations in the auditory system.
- Exposure to very low frequencies can lead to insufficient stimulation of the auditory nerve, limiting sound perception.
Step 3
Explain how the signals in Figure 13a and 13b show that there is a crack in the metal bar in Figure 13b.
Answer
In Figure 13a, the signals received indicate a consistent pattern with no interruptions, indicating that the bar is intact. However, in Figure 13b, the presence of a crack causes variations in the received signal, such as delays or missing signals, indicating a disruption in the metal's continuity.
Step 4
Suggest one reason why the amplitude of signal R in Figure 13b is smaller than the amplitude of signal P shown in Figure 13a.
Answer
One reason that the amplitude of signal R is smaller is that some energy is lost due to scattering and reflection at the crack, resulting in less energy being received compared to the intact metal bar seen in signal P.
Step 5
Explain what the diagram in Figure 15 shows about the density of the Earth and the nature of the Earth's core.
Answer
The diagram in Figure 15 illustrates how P waves and S waves travel through the Earth. P waves can pass through both solids and liquids, while S waves only travel through solids. The absence of S waves in certain regions suggests that those areas contain liquid, indicating that the outer core is liquid. The presence of both wave types in solid regions indicates that the inner core is composed of solid material, suggesting varying densities within the Earth’s layers.