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Lesson 1: Waves

# Wave properties

The wavelength and frequency of a wave are related to one another by the speed of travel of the wave, which depends on the type of wave and the medium through which it is passing. Created by Khan Academy.

## Want to join the conversation?

• Does your voice just stay in one frequency when you're speaking, or does it changes with every sound you make?
• The frequency changes while you speak because the sounds that compose words are a variety of frequencies.
• could I theoretically cancel out someone else's voice using destructive interference
• Yes. If your wave is inverted to someone else's, it would cancel the wave out.
• can I use science to make a car sound like an absolute beast
• Technically, yes- especially this lesson and the ones associated with it. But... why?
• It says this is in Middle School physics - NGSS, what does NGSS mean?
• Next Generation Science Standards.
• How could sound travel faster in water? I thought that sound travels a lot faster in air because it isn't as thick at water (I'm not sure if what I said makes any sense whatsoever) Could you explain why it travels faster in water a little bit more?:)
(1 vote)
• Sound travels faster in water than in air because water is denser than air. The denser the medium, the faster sound waves travel through it. The speed of sound in water is about 1,500 meters per second, compared to about 340 meters per second in air1.

I hope this helps!
• how do I cook pizza at a school?
• by cooking one
• So does this mean if space is a giant vacuum, that sound can't be heard in it because of the way that sound travels through matter?
• are wavelength and frequency of a wave related in any other ways
• yes, frequency is a property of waves
(1 vote)
• I'm in 6th grade!! This video doesn't Help AT ALL!

Edit; Why are all these people responding and some of these have nothing to do with what I said