Question

which object is an example of a mechanical wave?
○ light from a flashlight
○ sunlight
○ police siren
○ microwaves used to heat food

Explanation:

Mechanical waves require a medium to travel (like air, water, solids), while electromagnetic waves (light, sunlight, microwaves) do not. A police siren produces sound waves, which are mechanical waves (needing air as a medium). Light from a flashlight, sunlight, and microwaves are electromagnetic (no medium needed).

Answer:

C. police siren (assuming options are labeled A: light from a flashlight, B: sunlight, C: police siren, D: microwaves used to heat food)