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AP Physics 1 Videos 86 videos

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AP Physics 1: 2.4 Waves 13 Views


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Description:

If you've ever listened to someone with coffee breath, you know that the closer they scoot, the more intense it gets. It's pretty much the same principle with radiation.

Language:
English Language

Transcript

00:01

No and here's your shmoop du jour brought to you

00:04

by intensity intensity can be a good thing especially when

00:09

we're getting ready for a big test But too much

00:11

intensity when we're studying can be a bad thing Even

00:14

we hear it smoking a little sleep well a longitudinal

00:19

wave source lambda is located five meters to the left

00:23

of point x A trans verse wave source bro is

00:27

ten meters to the right of point x Both sources

00:30

emit s o tropic radiation of the same power What

00:35

can be said about the ratio of intensities measured at

00:39

point x All right here The potential answers Yes we

00:43

got all that intensity introduction thing Okay well we've got

00:46

trans verse waves We've got longitudinal waves We've got s

00:51

o tropic radiation This is like the start of a

00:54

superhero origin story or something But before we get to

00:58

the part where shmoop er man comes to earth let's

01:01

figure out how these intensities relate well ice A tropical

01:04

radiation emanates from a point source and it shoots out

01:08

in all directions with equal intensity Because of this fact

01:12

the farther we are from the source of radiation the

01:15

less the intensity we feel in fact intensity is proportional

01:20

to the inverse square of the distance from the source

01:24

of radiation So if one object a is twice a

01:28

ce far from a radiation source as object be than

01:32

object a will get hit with one quarter of the

01:36

radiation object b receives which means for our question since

01:40

object lambda is one half the distance from the source

01:43

of the radiation as object row the radiation received from

01:47

lambda will be four times higher So our answer is

01:51

a but let's run through the math Just to be

01:53

sure the leftward intensity is proportional to the inverse square

01:57

of the leftward radius and the right word intensity is

02:01

equal to the inverse square of the right word radius

02:04

since we're looking for the radius will set the leftward

02:07

intensity over the right word intensity With this complex fraction

02:11

it simplifies to the right word Distance squared over the

02:15

left word distance squared We just plug in our numbers

02:18

and sure enough we get same answer Leftward intensity is

02:21

four times higher and let's try to keep our studying

02:24

intensity at a reasonable level A five maybe a six

02:27

We've been at ten before and it wasn't pretty after

02:30

we woke up in the closet muttering about wave frequencies

02:34

Who decided Tto dial it back a bit and go 00:02:37.51 --> [endTime] decaf

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