but this is the relationship that these are tied together like that which is kinda nice, you know? in general, we just say speed and c was for the speed of light. on the 300,000 kilometers per seconds, is that a convention for the convenience of math or that the actual speed. it's almost that actual speed. it's 299 and i can't remember the numbers, but it's very, very close to 300,000 kilometers per second. yeah, it's not--now, that's rounded off. and you will find that later on in the book, what the presently accepted value is. it's close to that. did you ever wonder about a radio wave, how long maybe the wavelengths might be? the wavelength we saw over here is about less than a meter. there are radio waves in this room, gang, you'd be knowing that. how long are these waves? are they tiny, tiny? are they big, big? well, we can find out. we can find out because if speed is frequency times wavelength and the speed of a radio wave-- does anyone here know what the speed of a radio signal is that come from the radio antenna's downtown? anyone here know what the speed of those signals a

nice colors at sunset. isn't that neat? it, kinda, makes sense, doesn't it? here's another thing that makes sense too. when you look at the clouds, what color are the clouds normally? white. they're white. but there is no reason for that. did you know that? yes. there's no reason for the cloud being white is there, right? come on, come on, can anyone see why the clouds are white? if the clouds are white, what are you got to see, low frequency or high? [shouting] but what is gonna-- but if the clouds are all little teeny, teeny, teeny particles that will scatter high. so why aren't the clouds blue? because they don't-- my premise was off. i said, "if the clouds are little tiny, tiny, tiny particles." if the clouds, gang, is all tiny, tiny, tiny, particles, what are the clouds in fact? how many say, "well, in a cloud, "there's a whole assortment of sizes. "some get so big they absorb and they turn dark. and, honey, that's a thunder cloud coming up"? how many can see that? in the cloud, you get all kinds of sizes, yeah? all kind of sizes, all kinds of scattering, yes? and all kinds of scattering gonna lo

you saw the film that kinda got into all the stuff about counting flashes, counting flashes and all that sort of things. would you like to see that nice and succinct so there's no question? so when you look at what i'm gonna put on the board, boom, it all makes sense? time dilation comes alive. would you like to see that? i can do that for you right on that empty part of the board. would you like to see it? never mind the talk, never mind the rhetoric. let's get to it, huh?. here's time dilation. hey-ey-ey. all right, huh? - that do it for you? - yeah. now...what's that mean? this is derived in the footnote of your textbook, is that not true? simple pythagorean theorem, right? geometry, okay? i won't go through the elaboration now. but it just states that the time, the funny business, time. the time that one will experience due to relativistic effects-- meaning really motion effects, huh? the time that one will experience will have to do with the time that one would experience if there were no motion at all. t sub zero. but modified by the square root of 1 minus v-squared/c-squared v is the relative speed between that being observed a

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nice colors at sunset. isn't that neat? it, kinda, makes sense, doesn't it? here's another thing that makes sense too. when you look at the clouds, what color are the clouds normally? white. they're white. but there is no reason for that. did you know that? yes. there's no reason for the cloud being white is there, right? come on, come on, can anyone see why the clouds are white? if the clouds are white, what are you got to see, low frequency or high? [shouting] but what is gonna-- but if the clouds are all little teeny, teeny, teeny particles that will scatter high. so why aren't the clouds blue? because they don't-- my premise was off. i said, "if the clouds are little tiny, tiny, tiny particles." if the clouds, gang, is all tiny, tiny, tiny, particles, what are the clouds in fact? how many say, "well, in a cloud, "there's a whole assortment of sizes. "some get so big they absorb and they turn dark. and, honey, that's a thunder cloud coming up"? how many can see that? in the cloud, you get all kinds of sizes, yeah? all kind of sizes, all kinds of scattering, yes? and all kinds of scattering gonna lo

it'll kinda infest the whole package. but you want a nice, shiny, firm, no mold. >> ok, good, good, good. >> one thing that a lot of people will dg is take these home and wash 'em up right away. but really, if you're not going to use them that very first day, you'll want to put them in the refrigerator just like this in the container, and then take 'em out and wash 'em as you need 'em. >> oh, really? >> because that water, that moisture can tend to cause a little bit of mold to start growing on them. so you definitely don't want that. so wash 'em as you need 'em. >> so how long would you store these in the fridge, would you say? >> you know, some people stretch it 3, 4, 5, 6 days, but you definitely don't want to stretch it beyond 6 or 7 days. >> too much longer than that, right? >> that's going to push the limits of it. >> ok, good, good, good. and when in doubt, if you have any questions, ask your local produce man, right? >> the produce manager that's on duty, they're the experts in the field. they know what's going on. they know what's c