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A sound wave travels from air into water - OCR Gateway - GCSE Physics - Question 1 - 2023 - Paper 4
Question 1
A sound wave travels from air into water. Which quantity stays the same? A. Amplitude B. Frequency C. Speed D. Wavelength Your answer _____
Worked Solution & Example Answer:A sound wave travels from air into water - OCR Gateway - GCSE Physics - Question 1 - 2023 - Paper 4
Step 1
Which quantity stays the same?
Answer
When a sound wave travels from one medium to another, various properties of the wave change. The amplitude generally decreases, the speed of sound changes based on the medium (speed is higher in water than in air), and the wavelength changes as well because it is related to the speed and frequency of the wave.
However, the frequency of the sound wave remains constant as it transitions from air to water. This is because frequency is determined by the source of the sound and is not affected by the medium through which it travels. Therefore, the correct answer is B: Frequency.