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- One afternoon, Rick went t=
- Meanwhile in Mike's mind, something's going on.
- My bro's going to the library, what is it again that I wanna ask?
- MMMMMMM.......
- COME ON MIKE, THINK!
- AHA!
- Mike, Mike!!!
- Mike finally found the courage to ask Rick's help.
- RICK! Sorry I'm thinking of something.
- Uhhh..I find it hard to understand our lesson in Science.
- About the propagation of sounds through matter? Ok, I'll discuss it with you.
- Hey, can you share me what it is?
- Rick tagged Mike along in the library.
- Alright, since we are here in the library, let's lower our voices.
- Ok sure.
- And the discussion went on...
- Let's start with how sound travels. In order for sound to travel, it must have a source. It could be anything around us. Then, there should be a medium for it to propagate, it may be solid, liquid or gas.
- Rick explains why sound propagates fastest through solid, next is liquid and slowest through gas.
- The reason is because of varying densities of their particles. The molecules of solids are tightly packed and it is very dense, which makes it easier for sound to spread. Unlike in liquids and gases where their molecules or particles are either loosely packed or freely moving, which takes longer time for sound to spread.
- Mike asks some examples on how sound propagates...
- In solid....
- In solid, when you put your ear on the table and someone taps on it, you can hear immediately the vibrations or the sounds produced by tapping. When sound travels on wood, it covers 3960 m/s.
- We all know that sound propagates fastest in solids, next is liquid and slowest in gases.
- But why is that so?
- through liquid.....
- In liquid, boats and vessels use sonar technology for navigation, underwater communication and detection of objects and other sea vessels to avoid accidents in water. Usually, sound travels between 1450 and 1570 m/s in seawater.
- And through gas.
- And on gases, when someone plays music over the speakers, the sound would travel in the air to your ears. The sound gets louder as you move forward to the source and weaker when you move backwards. At 20 degrees Celsius, the speed of sound in air is 343 m/s.
- Oh, I see. Can you give me some examples please?
- Sure I'll give you some examples.
- Now everything is clear to Mike...
- At the end, they decided to go home.
- Is everything clear for you now?
- Yes. The lesson is now clear to me. I really learned a lot Rick!
- You're welcome Mike. Let's now go home.
- Thank you so much for the help
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