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Question
Which of the following will remain unchanged when a sound wave travels in air or in water?
Options
Amplitude
Wavelength
Frequency
Speed
MCQ
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Solution
Frequency
Explanation:
When a sound wave moves from one medium to another, its frequency remains unchanged because it is determined by the source. The speed changes in different media, so the wavelength also changes since
\[\lambda=\frac{v}{f}\]
The amplitude may also change at the boundary.
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