JAMB - Physics (1979 - No. 6)
Which of the following types of waves cannot travel through a vacuum?
sound waves
light waves
infra-red waves
x-radiation
redio waves
Пояснення
Sound waves are mechanical waves that require a medium (such as air, water, or solids) to propagate.
Light waves, infra-red waves, x-radiation, and radio waves are electromagnetic waves and can travel through a vacuum.