✋Introduction
Travelling sound
In this lesson: I can explain why sounds are quieter at a greater distance, and why sound waves travel faster in solids and liquids than gases but not at all through a vacuum. Sound spreads out and becomes quieter (lower amplitude vibrations) as it travels. Sound travels through a medium by vibrations being passed on between the particles of the medium.
Lesson outcome
Waxaan sharxi karaa sababta codka uu uga sii aamusnaan fogaan, iyo sababta mowjadaha codka ugu dhakhsaha badan adkaha iyo dareeraha marka loo eego gaasaska, laakiin aan gabaad ka dhex mari karin.