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AP Physics 1: 1.4 Waves 180 Views


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AP Physics 1: 1.4 Waves. Which of the following is technically true for Max as he stands at the edge of oblivion? 

Language:
English Language

Transcript

00:04

And here's your shmoop du jour brought to you by the Grand Canyon the

00:08

Grand Canyon was created by one River over a super long period of time and [Man looking out onto the Grand Canyon]

00:12

it's considered one of the wonders of the world but we try to dig one hole to

00:16

China when we're seven and well Dad freaks out.. All right, at the Grand [Girl digging a hole in the garden and Dad appears angry]

00:20

Canyon, Max leans over the railing of a beautiful but dangerous vista, his mother

00:25

cries in distress while stepping back from the ledge and his father yelps [Max leaps over the ledge and Mother cries]

00:29

while lunging forward to grab him which of the following was technically true

00:33

for Max as he stands still at the edge of oblivion and here the potential answers

00:37

[Mumbling] All right well

00:42

yeah the Grand Canyon might not be the best place to try and get a closer look [Max jumps down the Grand Canyon]

00:45

at something one mistake and we could see billions of years of history fly

00:50

past but this isn't AP Geology, so let's look at the physics of the Doppler

00:56

effect so the Doppler effect occurs when a wave source is in motion relative to [Boy at the side of the road staring at a car and tortoise]

01:02

an observer if the wave source is approaching the observer the wave

01:06

frequency relative to the observer increases it goes like that if the wave

01:11

source is receding from the observer the frequency will decrease that sounds all

01:16

technical and abstract so let's think of it in real life. Think about being [Boy reading a book]

01:20

stopped at a train crossing as the train approaches the pitch of its horn gets

01:24

higher that's because the sound waves are moving at a higher frequency as the [Train travelling past a parked car]

01:28

train approaches after the train goes by the horn has a lower pitch because the

01:33

waves have a lower frequency as it moves away it was like that we can think of it

01:38

in another way too - Let's say we're playing with our friend Wild Bill - Wild

01:42

Bill has invented a new toy; a ping pong ball machine gun yeah like that the gun [Wild Bill with a ping pong ball machine gun]

01:48

shoots ping pong balls at a rate of one per second... If he stands

01:52

still and shoots ping pong balls at us will get hit once every second he's a [Wild Bill shooting a ping pong ball at a girl]

01:56

good shot, but if he comes charging at us we'll get hit more frequently because the

02:02

distance between us and the source of the ping pong ball will be decreasing so [Wild Bill moves closer to girl and shoots ping pong balls]

02:06

the balls will have less time in the air for every shot and so it makes sense

02:10

that when we finally snap and yell at Wild Bill [Girl shouts at Wild Bill and he runs away]

02:13

making him run away from us we'll get hit less frequently.. Wild Bill's kind of a

02:18

jerk why are we friends with this guy anyway anyway let's get back the Grand

02:22

Canyon. Since Max's Dad is moving toward him the frequency of his voice will increase [Max's Dad runs towards Max and voice frequency increases]

02:26

making the pitch higher so the correct answer is D. Next time we're at the Grand

02:30

Canyon we'll keep our distance from the edge we're not big on heights [Boy scared while standing near the rails of Grand Canyon]

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