Light Is Waves: Crash Course Physics #39

The way light behaves can seem very counterintuitive, and many physicists would agree with that, but once you figure out light waves it all starts to make more sense! In this episode of Crash Course Physics, Shini shows us how we know that light exists as a wave and why that's really cool!

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[crashcourse]

We made quiz questions to help you review the content in this episode! Find them on the free Crash Course App!

[Master_Therion]

Is light a particle or a wave? Or is it just *particularly wavy?*
;)
joke, not a real question.

[vonneely]

I keep waiting for her to take a breath but it never happens.
o.O
O.o
O.O


I, for one, welcome our new Smart-Bot overlords.

[pivotman]

Let it be known that the people behind Crash Course play Enter the Gungeon.

[StickyTank]

i once did the double slit experiment, using a laser-pen and some tin foil. i was amazed when it actually worked and created a beautiful interference pattern on my wall :D

[supamayn]

THANK YOU. I took a physics series and this was a perfect summing up of what I had learned about diffraction. I really needed a refresher.

[maryamalhamdan]

My favourite thing about crashcourse is their into music

[yugeshkeluskar]

I was not able to understand this topic in my college and my exams are near. You put this video at the right time .... thank you so much crash course

[brento]

Perfect explanation !!!! I just replicated it with my smartphone flashlight, and some books. Works exactly as stated.

[jarredc]

Whose quarantined and watching this for school?

[srrex]

How hasn't anyone noticed the amazing Enter the Gungeun reference!?great vid btw

[maverick.gaurav]

Greaaaat video...super cool animations make things like these really easy to understand. which I'm sorry to say, books just can't deliver.

[thanhvutien]

Very nice video. Could anyone know which video tool to create this video animation? Thank you.

[Gaia_Rei]

Light Wave sounds like a c-list DC villain the Teen Titans would fight.

[djbslectures]

Doesn't the presence or not of the bright spot in the middle of the shadow depend on some relationship between the wavelength and the diameter of the circle?

[LordOfNothingreally]

I have no idea what this pretty lady is talking about, but I sure am enjoying watching her talk about it *swoon*

[TheAwesomePieGuy]

What does the DFTBA at the beginning stand for?

[davidcampos]

Do the double slit experiment with a razor blade frame to form each slit and see what you get.

[mcitup]

I tried to do the coin experiment to see if a spot of light to see if the dot would appear but it didn’t. I tried to find information on how to to it but can’t find any info on that experiment. Any tips on how to do it

[hedving]

what are particular rays of light? how do you know one from the other?