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AP Physics 1: 1.3 Waves 220 Views
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Description:
AP Physics 1: 1.3 Waves. Find the wave speed.
Transcript
- 00:00
Thank you We sneak And here's your shmoop to use
- 00:05
your brought to you by traveling waves Of course our
- 00:08
favorite way to travel waves is by hanging ten on
- 00:10
a sweet surfboard were goofy footed Well by hanging ten
- 00:14
we mean ten fingers clutching the board Yeah surfing is
Full Transcript
- 00:17
scary We've seen jaws and we know what's in the
- 00:19
oceans All right a travelling wave has a period of
- 00:23
two seconds and amplitude of five millimeters and a wavelength
- 00:27
of one meter What is its wave speed And here
- 00:31
the pencil answers All right Okay well here we go
- 00:36
So we're looking for the velocity of a wave here
- 00:38
and no we're not talking about saying goodbye after a
- 00:40
double espresso to find the velocity of a wave we
- 00:43
multiply the wavelength times the frequency Uh but we don't
- 00:46
know the frequency yet Minor detail let's strap on our
- 00:49
math hat because they were about to figure it out
- 00:52
And people we don't actually have a math hat It's
- 00:54
more of a beanie rainbow beanie with a propeller Look
- 00:57
it helps us think ok it's like they're googler All
- 01:00
right Because frequency and period are reciprocal The equation to
- 01:03
find the frequency is one over the period In this
- 01:07
case the period is two seconds so the frequency is
- 01:10
point five hurts right One over two in california is
- 01:13
a half yet one too hard Now we can plug
- 01:15
in the numbers remember way back when we mentioned at
- 01:18
velocity equals wavelength times frequency Those were the days So
- 01:23
the wavelength of one meter and a frequency of point
- 01:25
five hearts our velocity is point five meters per second
- 01:31
So the correct answer is b yeah we didn't use
- 01:34
the amplitude even though it was given in the original
- 01:36
question There's very good reason for that which is that
- 01:39
it was irrelevant remember do not get hung up on
- 01:42
using everything in a question just because a question gives
- 01:44
us a quantity doesn't mean we have to use that
- 01:46
to get the right answer Sometimes a test will try
- 01:48
to throw us off our game by giving us too
- 01:50
much information but our games too strong now for that
- 01:53
to work on Now that we've reminded ourselves how strong
- 01:56
we are we're going to go be brave and get
- 01:58
back in the water on that surfboard We'll just start 00:02:02.1 --> [endTime] with a bathtub Yeah Baby steps people
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