Hot chocolate effect. Tap a metal spoon inside a mug of water and note the frequency fi
Chapter 17, Problem 8(choose chapter or problem)
Hot chocolate effect. Tap a metal spoon inside a mug of water and note the frequency fi you hear. Then add a spoonful of powder (say, chocolate mix or instant coffee) and tap again as you stir the powder. The frequency you hear has a lower value fs because the tiny air bubbles released by the powder change the waters bulk modulus. As the bubbles reach the water surface and disappear, the frequency gradually shifts back to its initial value. During the effect, the bubbles dont appreciably change the waters density or volume or the sounds wavelength.
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