What is Infrared Light? William Herschel's Amazing Discovery of Infrared Radiation and Waves - 02
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What is infrared light? Here
What is infrared light? Here we will learn the story of William Herschel and how he completely by accident discovered infrared light. Infrared Radiation (IR) was unknown in his time, but now we know that the IR spectrum is just a small part of the broader electromagnetic spectrum.
Herschel discovered infrared radiation by measuring the temperature of different parts of the visible light spectrum made by passing sunlight through a prism. He discovered that just beyond the red part of the spectrum were invisible infrared waves. Now we know that the definition of infrared light is just longer wavelength waves in the EM spectrum. We also now know that infrared rays are associated with heat and that the infrared frequency range is just beyond that of the red light in the visible rainbow.
---------------
Hello welcome to smarter in
science we're going to take a few
minutes of your time and learn together
about something truly amazing in the
realm of science.
Today we're going to
talk about the amazing discovery of
infrared radiation. There's a really cool
story behind infrared radiation and how
it was discovered i'm going to share
that with you today.
The first thing is let's talk a little
bit about what is infrared radiation and
that is basically the type of light in
type of invisible light that we
associate with heat is given off by an
object. so here are a couple of examples
of that here's a space shuttle that's
just coming from the atmosphere it's
gotten very very hot
notice the underside of the ship is kind
of as the reddish colors and the whitest
the whitish color is where the top of
the ship is blue bullish colors.
so what
this means obviously the bottom of the
ship hotter and when something is hotter
it radiates more infrared radiation and
so those why the coat that's why the
colors are red there where is the top of
the ship is not as hot and in this
picture is represented by blue because
it's not radiating as much in the
infrared there on the top of the ship.
here's a picture of a house and you can
see sort of the same thing here most of
the house for instance the the the roof
here is a bluish color that means that
there's not very much heat coming out of
the roof there it's nicely insulated
there but the ridgeline here at the top
of the house the windows the doors
things like that it's very hard to
insulate those so you see the heat coming
through the windows and the doors and
that's why you see the red there because
the heats coming from the inside of the
house out you see that in the infrared.
Ok
as I said before the discovery of how
this radiation behaves and how it was
discovered two stories really really
neat and we're going to talk about that
right now.
So I'd like to introduce you
to somebody if you've never heard of him
he's a famous scientist whose name's
William Herschel lived from 1738 1822. Now
this picture of our sun is a modern
picture of course Herschel never saw the
Sun as it is in this picture here from
this from a high-powered telescope or
satellite as we see it today.
Basically he spent a great deal of time
studying light from the stars with the
telescope that he used in his day and
what he did one of the things he did was
he was put these filters in front of the
telescope different color filters.
red
filters yellow filters blue filters to a
basically filter the light coming from
the Sun so that he could study in his
telescope and just from the interaction
with the telescope he started to realize
that he thought the red light from the
Sun when he would isolate the red light
seemed to be hotter than the other
colors as he would isolate them with his
filters now this wasn't a scientific
experiment this was just something he
was noticing so he decided to
investigate further.
now even back in Herschel today the
scientists of the time were well aware
that sunlight can be broken down with
composed of a whole host of colors of
the rainbow there and he knew all about
prisms that could do that job.
So he knew
that sunlight was a mixture of all the
colors of the rainbow and he knew that
he could take white light and split it
up into the different colors
violet indigo blue green yellow orange
and red so what he wanted to do with
scientifically see if any of these
colors coming from the Sun actually had
a higher temperature or did they all
behave the same.
So in order to do that
he decided to set up an actual
experiment to test and see if they were
all the same or any of the colors were
hotter or colder than any of the other
ones. now here's what we have a sort of
an artist rendition of him of a personal
in his laboratory and you can see the
sunlight coming in being split by the
prism and form a rainbow down here now.
in 1800 he devised his experiment to see
if the different colors of the rainbow
actually had different temperatures, and along the way he
completely by accident discovered infrared light.
Herschel discovered infrared radiation by measuring the temperature of different parts of the visible light spectrum made by passing sunlight through a prism. He discovered that just beyond the red part of the spectrum were invisible infrared waves. Now we know that the definition of infrared light is just longer wavelength waves in the EM spectrum. We also now know that infrared rays are associated with heat and that the infrared frequency range is just beyond that of the red light in the visible rainbow.
---------------
Hello welcome to smarter in
science we're going to take a few
minutes of your time and learn together
about something truly amazing in the
realm of science.
Today we're going to
talk about the amazing discovery of
infrared radiation. There's a really cool
story behind infrared radiation and how
it was discovered i'm going to share
that with you today.
The first thing is let's talk a little
bit about what is infrared radiation and
that is basically the type of light in
type of invisible light that we
associate with heat is given off by an
object. so here are a couple of examples
of that here's a space shuttle that's
just coming from the atmosphere it's
gotten very very hot
notice the underside of the ship is kind
of as the reddish colors and the whitest
the whitish color is where the top of
the ship is blue bullish colors.
so what
this means obviously the bottom of the
ship hotter and when something is hotter
it radiates more infrared radiation and
so those why the coat that's why the
colors are red there where is the top of
the ship is not as hot and in this
picture is represented by blue because
it's not radiating as much in the
infrared there on the top of the ship.
here's a picture of a house and you can
see sort of the same thing here most of
the house for instance the the the roof
here is a bluish color that means that
there's not very much heat coming out of
the roof there it's nicely insulated
there but the ridgeline here at the top
of the house the windows the doors
things like that it's very hard to
insulate those so you see the heat coming
through the windows and the doors and
that's why you see the red there because
the heats coming from the inside of the
house out you see that in the infrared.
Ok
as I said before the discovery of how
this radiation behaves and how it was
discovered two stories really really
neat and we're going to talk about that
right now.
So I'd like to introduce you
to somebody if you've never heard of him
he's a famous scientist whose name's
William Herschel lived from 1738 1822. Now
this picture of our sun is a modern
picture of course Herschel never saw the
Sun as it is in this picture here from
this from a high-powered telescope or
satellite as we see it today.
Basically he spent a great deal of time
studying light from the stars with the
telescope that he used in his day and
what he did one of the things he did was
he was put these filters in front of the
telescope different color filters.
red
filters yellow filters blue filters to a
basically filter the light coming from
the Sun so that he could study in his
telescope and just from the interaction
with the telescope he started to realize
that he thought the red light from the
Sun when he would isolate the red light
seemed to be hotter than the other
colors as he would isolate them with his
filters now this wasn't a scientific
experiment this was just something he
was noticing so he decided to
investigate further.
now even back in Herschel today the
scientists of the time were well aware
that sunlight can be broken down with
composed of a whole host of colors of
the rainbow there and he knew all about
prisms that could do that job.
So he knew
that sunlight was a mixture of all the
colors of the rainbow and he knew that
he could take white light and split it
up into the different colors
violet indigo blue green yellow orange
and red so what he wanted to do with
scientifically see if any of these
colors coming from the Sun actually had
a higher temperature or did they all
behave the same.
So in order to do that
he decided to set up an actual
experiment to test and see if they were
all the same or any of the colors were
hotter or colder than any of the other
ones. now here's what we have a sort of
an artist rendition of him of a personal
in his laboratory and you can see the
sunlight coming in being split by the
prism and form a rainbow down here now.
in 1800 he devised his experiment to see
if the different colors of the rainbow
actually had different temperatures, and along the way he
completely by accident discovered infrared light.
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