Scooby-Doo! A Science of Sound Mystery: A Song for Zombies
Scooby Doo and the gang drove home after a long day at school Man I love my new music class said Shaggy I could play this tambourine all day every day Velma covered her ears I don't think my eardrums could take that Watch out for those kids Fred shouted Daphne Fred slammed on the brakes They don't look like kids at all he said
What's going on here Velma asked an officer All the kids in the neighborhood have been zombified said the officer The adults are terrified Rombified asked Scooby Zombified Like what's zombifying them asked Shaggy The officer showed the gang a photograph This creature was spotted in the neighborhood late last night Whenever it played the pan flute children turned into zombies and followed it
I'm confused said Shaggy The kids were asleep in their beds How did the music get inside their houses Sound travels through air water and even walls it it's loud enough Daphne said small wavelengths for high frequency sound Sound is a kind of energy like heat and light Velma explained When something vibrates like your vocal cords or an instrument it makes sound waves The waves cause molecules to move As the molecules bump into each other they make sound large wavelengths for low frequency sound FACT FILE Sound travels through the air at 1 129 feet 344 meters per second It travels through steel at 16 404 feet 5 000 m per second
Sound waves move faster through denser materials like water and metal Fred said The molecules are packed together closely The sound waves pass more easily from molecule to molecule You've lost me again Shaggy said Imagine this fence is a block long Velma said If you held your ear to the fence at one end of the block and I hit the fence with a hammer at the other end of the block which ear do you think would hear the sound first Shaggy scratched his head Like the ear on the fence Right The sound waves move much faster through metal than through air Velma explained FACT FILE In outer space there is no sound There is no air or other material for sound waves to travel through
