Refraction of seismic waves | Cosmology & Astronomy | Khan Academy
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Refraction of Seismic Waves. Created by Sal Khan. Watch the next lesson: https://www.khanacademy.org/science/cosmology-and-astronomy/earth-history-topic/seismic-waves-tutorial/v/the-mohorovicic-seismic-discontinuity?utm_source=YT&utm_medium=Desc&utm_campaign=cosmologystronomy Missed the previous lesson? https://www.khanacademy.org/science/cosmology-and-astronomy/earth-history-topic/seismic-waves-tutorial/v/why-s-waves-only-travel-in-solids?utm_source=YT&utm_medium=Desc&utm_campaign=cosmologystronomy Cosmology & Astronomy on Khan Academy: The Earth is huge, but it is tiny compared to the Sun (which is super huge). But the Sun is tiny compared to the solar system which is tiny compared to the distance to the next star. Oh, did we mention that there are over 100 billion stars in our galaxy (which is about 100,000 light years in diameter) which is one of hundreds of billions of galaxies in just the observable universe (which might be infinite for all we know). Don't feel small. We find it liberating. Your everyday human stresses are nothing compared to this enormity that we are a part of. Enjoy the fact that we get to be part of this vastness! About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. We've also partnered with institutions like NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content. For free. For everyone. Forever. #YouCanLearnAnything Subscribe to Khan Academy’s Cosmology & Astronomy channel: https://www.youtube.com/channel/UChNPnEkW8LYZ5Rwi8_A2-DA?sub_confirmation=1 Subscribe to Khan Academy: https://www.youtube.com/subscription_center?add_user=khanacademy
Comments
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i've been using your channel since my foundation year. i really like your channel! it helps me a lot. keep it up!
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Don't seismic waves slow down with increasing density?
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2 hours of lectures explained in ten minutes, thank you!
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I would say this is the best explanation to expalain refraction of seismic waves or any waves for that matter. Salute you. Thanks a lot
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Finally makes sense. Thanks!
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so much easier to learn it this way , great explanation ! no more confusion thanks to you !
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Thank you so much! This helped me alot~
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to ask for help
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How do you screen record this
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great car analogy. thanks Sal!
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very useful,,,thanks very much. would you be able to add something about seismic wave propagation and ray theory, whenever you have time. not that we cant go through books but the way you explain is really awesome.
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This helped me SO much thank you!
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WOW! This was uploaded on my birthday! lol
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Density does not increase wave velocity rather the increase in rigidity and incompressibility compensates for the density increase, and therefore the net effect is to increase wave velocities. You can see this by looking at the velocity equations for both p and s waves.
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Another great video Mr. Khan. One quick question though. If this was the real earth, would the waves begin to curve back after they got through the center (because the material becomes less and less dense)?
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thanks for doing this. I hope you realize how big this contribution is to education.
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first!
9m 22sLenght
145Rating