Resonance

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so now can you guess the answer some of

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our questions

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someone can never really create that

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level of pressure and not never already

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but it's very hard to create enough to

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break a glass but what it can do is that

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if you just take a piece of glass and

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find out what its natural frequency is

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then play sound that is very close to

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that the glass begins to oscillate

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just a little the ampule is very very

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small not even close to enough to break

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but given enough time with this

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frequency playing the glass being starts

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late more and more and more it's

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undeterred increases to a point where

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it's almost like somebody's holding the

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glass in try to break it apart in there

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it cracks the same thing is true with

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bridges is very the same story

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if soldiers are walking in stem then

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they have the concept of an overall

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frequency okay it might so happen and

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it's very rare in these days but it

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might so happen in the olden times that

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that might be close to the natural

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frequency of that particular bridge or

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sometimes you want to prove it even

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that's good enough then what might

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happen the bridge begins to start at a

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larger and larger and larger amplitude

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and eventually rings so nowadays what

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they do is they put dampers on these

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large bridges huge hydraulic dampers so

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that if this happens we stop it

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that must be a question in your mind

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okay when we spoke about damping one of

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the questions of you also see each of

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these cars and bikes have suspensions

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which are basically just spring with a

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very tough it's displaying but you can't

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really press it very easily and why are

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they there but when the car passes over

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some obstacles the spring compresses and

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doesn't pass on them

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just the people sitting inside but if

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the spring what I do after they get off

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set the spring must keep oscillating

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never lose this guy never loses its

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energy so your entire it will be a

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really bouncy one yeah but we know put

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dampers there as well to make it so that

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the spring eventually ends up stopping

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so both damping and for sayin

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oscillations have applications and this

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particular last application which is the

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driving force being very close to the

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natural frequency has a name

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that's called resonance yeah I know

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where I say resonance you think of

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benzene rings and electrons floating

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making them to the point of having

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electron close not talking about that it

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doesn't want resonance and physics and

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if you wondering why they keep using the

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same words over and over again think

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harder immediately maybe we'll get to

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the answer so this is resonance in

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physics actually has a lot of

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applications a lot of times musical

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instruments work on this principle and a

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lot of what we will talk about after

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this waves on a string guitars and sound

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and acoustics Lutzer other wind

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instruments they're all going to be

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quite a bit connected to the ideas that

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we've learnt in this particular chapter

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