JAMB - Physics (1980 - No. 27)
Which of the following statements about sound is NOT true?
sound is a longitudinal wave
sound can be reflected and refracted like light
sound travels through a vacuum
sound moves faster in a steel wire than in air
sound can ony be produced by vibrating objects
คำอธิบาย
Sound cannot travel through a vacuum. A vacuum is an area without any air, like space. So sound cannot travel through space because there is no matter for the vibrations to work in.