# AP Physics 1: 2.5 Waves

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AP Physics 1: 2.5 Waves. Which other quantities need to be measured?

AP Physics 1 | Waves |

Language | English Language |

### Transcript

They're given the length of the string which other quantities

that they need to measure select two answers aren't here

The options period number two All right well the key

to answering this question figuring out the right equation to

use we need an equation that includes velocity is a

variable So the equation to find the wavelength two times

length divided by the number of anti nodes Just one

more velocity Well what about frequency Frequency equals the number

of anti nodes times velocity divided by the length times

two All right yeah That'll work there's that little bee

way already need to know the length of the string

So the only other things we need would be the

number of nodes which is answer beams so that's one

of our correct choices But the other choices period amplitude

and distance between anti nodes All those aren't involved in

this equation well we know that the frequency is the

reciprocal of the period so if we know the period

then we can figure out the frequency right So the

other correct answer is a period when we're faced with

questions like this We'll have to scroll through our equation

friends list to get the right answer but this is

the kind of abstract thinking that really defines what a

physicist does It's not just about math asked sheldon Math

gets as from point a to point b but a

lot of the time physics is about being at point

a and figuring out where point b is in the

first place Don't get us wrong though There still gonna

be math If we need help focusing a triple espresso

might do the Job 3 times 1 espresso thats matt

Of course that might just make us vibrate so much 00:01:52.81 --> [endTime] We turned into a standing wave ourselves No