Multiple choice

What happens to the sound when air is suck from the tumbler?

  1. Loudness increases

  2. Loudness decreases

  3. No effect

  4. Nature of the sound changes (from high pitch to low pitch)
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

When air is sucked from a tumbler (creating partial vacuum), there are fewer air molecules to vibrate and transmit sound waves. This reduces the amplitude of sound waves reaching your ear, making the sound softer or less loud. The loudness decreases due to reduced medium density.

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