Question

which of the following waves does not require a medium to travel?
sound waves
water waves
electromagnetic waves
seismic waves

Explanation:

Sound waves need a medium (like air, water, or solids) to propagate as they are mechanical waves. Water waves also rely on water (a medium) to travel. Seismic waves travel through the Earth's layers (a medium). Electromagnetic waves, such as light, can travel through a vacuum (no medium).

Answer:

Electromagnetic waves