Question

which of these would most likely cause a sound wave?
○ cookies baking
○ milk standing in the bottle
○ a spoon hitting the side of a bowl while mixing
○ butter melting

Explanation:

Sound waves are caused by vibrations. Let's analyze each option:

• Cookies baking: This is a chemical change (baking) with heat transfer, not direct vibration to create sound.
• Milk standing in the bottle: The milk is stationary, no vibration occurs to produce sound.
• A spoon hitting the side of a bowl while mixing: When the spoon hits the bowl, it causes the bowl (and surrounding air) to vibrate, which generates sound waves.
• Butter melting: This is a phase change (solid to liquid) due to heat, no vibration to create sound.

Answer:

C. a spoon hitting the side of a bowl while mixing