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What is Light? | روشنی کیا ہے؟ - Duration: 4:46.
Light,
is the connection between us and the universe.
Through light, we could experience distant stars
and look back at the beginning of existence itself.
But, what is light?
In a nutshell
Light, is the smallest quantity of energy that can be transported
A photon, an elementary particle without a real size
That can't be split, only created or destroyed.
Light also has a wave-particle duality
being kind of a particle and a wave at the same time
Also when we say light, we actually mean visible light
which is a tiny part of the electromagnetic spectrum:
energy in form of electromagnetic radiation.
Electromagnetic radiation consist of an enormous range of wavelengths and frequencies.
Gamma rays have the smallest wave lengths
because they are the highest energy photons.
But most gamma rays are just under ten picometers,
which is still way smaller than a hydrogen atom.
For reference, a hydrogen atom compared to a cent
is about as big as a cent compared to the Moon.
Visible light is in the middle of the spectrum
in a range of about 400 nanometers to 700 nanometers:
about the size of a bacteria.
On the other end of the spectrum,
radio waves can be up to 100 kilometers in diameter.
The biggest wave lengths we know exist
can span from 10,000 kilometers to a100,000 kilometers,
way larger than Earth.
From a physics stand point,
all these different waves are the same.
They all have the wave-particle duality and travel at 'c', the speed of light,
just at different frequencies.
So what makes visible light special, then?
Well... Absolutly nothing.
We just happen to have evolved eyes, that are good at registering
exactly this part of the electromagnetic spectrum.
This is not a complete coincidence though.
Visible light is the only set of electromagnetic radiation that propagates when in water,
and because light not only interacts with matter
it's also altered by it and
can be used to gather information about the world around us,with almost no delay.
Which is arguably really helpful for survival.
Okay, where does light come from?
A vast range of electromagnetic waves are created
when atoms or molecules drop from a higher state of energy to a lower one.
They lose energy and emit it in the form of radiation.
At the microscopic level,
visible light is created when an electron within an atom in an excited state
drops to a lower energy state and loses this excess energy.
The same way,
incoming light can elevate an electron to a higher state of energy
by being absorbed by it.
Macroscopically,
the moving charge of the electron creates an oscillating magnetic field,
Which creates an oscillating electric field perpendicular to it.
These two fields move themselves through space,
transferring energy from one place to another,
carrying information about its place of creation with it.
Why of all the things in the universe is light the fastest thing there is?
Let's change the question:
What is the fastest way to travel through space in the universe?
Its' speed of light, exactly
two hundred ninety-nine million, seven hundred ninety-two thousand, four hundred and fifty-eight metres per second in a vacuum
one billion kilometres per hour.
Electromagnetic radiation just happens to move this fast.
Any particle that has no mass
travels at c speed of light
without acceleration or any in between.
The light that has released from a candle does not speed up until it reaches light speed,
At the very instant of its creation, its speed is speed of light
So why is the speed of light, finite then?
Well, nobody knows.
Our universe is just built this way.
We don't have the smart answer here.
So light is part of a spectrum,
an elementary particle that also behaves like a wave,
Propelled by two perpendicular fields,
travelling at the speed limit of the universe.
Okay, that's nice, but what about the other crazy stuff
like travelling at the speed of light,
and understanding the relation between light and time
and other related questions
We would have to save them for another video.
For now, let's be happy that we've evolved eyes that pick up
waves of information permeating the universe.
Making us see things and put our existence into perspective.
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it's everyday bro but the lyrics is replaced by gio (razor) saying n word - Duration: 1:39.
dle this..
Y'all don't know what's about to happen baby..
Team 10.
Los Angeles, Cali boy.
But I'm from Ohio though, white boy
*song pauses*
Wait..
Ohio?
Ohio_Lionskeeper? (ohio if you are watching this what up)
I am disappointed in you. >:(
I AM DISAPPOINTED IN YE-
Anyways.. let's go further with this shitty song! :D
*songs plays again* (OH GOD PLEASE STOP THIS)*
It's everyday bro! with the disney channel-
NIGGER
5 mill on YouTube in 6 months, never done beforeo! (i meant to do that)
Passed all the competition man-
NIGGERMAN IS NEXT
Man I'm poppin' all these checks, got a brand new-
NI-GGER
And I met a Lambo too and I'm coming with the-
NIGGERS
This is Team 10-
NIGGER
Who the hell are flippin' you?
And you know I kick them out if they ain't with the-
NIGGER
Yeah, I'm talking about you, you beggin'-
FOR A NIGGERS
Talking shit on Twitter too but you still hit my phone last night:
It was 4:52 and I got the text to prove.
And all the recordings too, don't make me tell them the truth.
And I just dropped some new merch and it's selling like a -
NI-GGER
Ohio's where I'm from, we chew 'em like it's gum!
We shooting with a gun, the tattoo just for fun
I Usain Bolt and run, catch me at game one!
I cannot be outdone, Jake Paul is number one!
It's everyday-
NIGGERS
It's everyday-
NIGGER
IT'S EVERYDAY-
NIGGER
I SAID IT'S EVERYDAY-
NIGGER
You know it's Nick Crompton and my collar stay poppin'.
Yes, I can rap and no, I am not from Compton
NIGGER-
Is my city!
And if it weren't for Team 10, then the US would be shitty. (you sure nick?)
I'll pass it to Chance 'cause you know he stay litty!
Two months ago you didn't know my-
NIGGER
(ok that's it, bye people xd)
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Karma Is A Bitch Challenge #3 || NEW Trend 2018 - Duration: 5:56.
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Break Down Mental Barriers - What Is Learned Helplessness? - Duration: 2:26.
In this video I will explain exactly what learned helplessness is and how it
may be affecting your day to day life learned helplessness is a mental state
for an organism like a human or animal is exposed to adverse stimuli that is
unpleasant or painful and over time the organism becomes unwilling to escape
that adverse stimuli even if the conditions are now avoidable the theory
of learned helplessness was developed in the 1960s and 70s by American
psychologist Martin Seligman Seligman came across his theory when he
discovered that dogs who received unavoidable electric shocks for an
extended period of time failed to take action when the shocks
became avoidable a similar phenomenon occurs when breeders raise elephants aza
baby elephant it will be chained to a post in the ground so it can't escape
after multiple attempts to break free from its shackles the baby elephant will
build up the belief that their captivity is imminent as the elephant grows up it
becomes bigger and gain the strength to break free from its post however it is
now conditioned to believe that it cannot change the situation it is in so
how does learned helplessness affect our own lives sure we are not tied to a post
like elephants or shocked like the dogs in the study however humans often
experiences mental state as well for instance if you receive a bad grade you
may start to develop a mindset where you believe you may never succeed in school
like the elephant you may think that academic failure is imminent and never
make another attempt at that failed course or exam however as you invest
more time into your education and self-development
you will become more like the mature elephant who is strong and more than
capable of breaking free from its prior limitations at this point only your
mindset will come in the way of you and success thanks for watching if you
enjoyed this video please hit the like button and subscribe for more
informative content
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