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1795 - Light up your brain with new knowledge. Here
are interesting facts about the light of day. Just seeing it uses half your
brain. What is the oldest thing you have
ever seen? No it is not the
pyramids. Not even the dirt at your feet
that cannot be older than 4,500,000,000 years.
You need a telescope and your eyes can see photons that are
12,000,000,000 years old. What you see
is a young star but today it is 12 billion years older than that.
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--------------------------------------- 1795
- Light up your knowledge about
light
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Light did not start to shine until 340,000 years after the Big
Bang. Before then the charged particles
were so dense the photons just bounced around between them. Space had to expand enough for the photons to
be free to expand along with space expanding.
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This first light can still be seen today as Cosmic Microwave Background
radiation. The light that started out as
short wavelength Gamma Ray radiation has stretched to wider wavelengths as it
traveled through expanding space. The
light radiation left at 3,000 Kelvin and today it has cooled to just 2.75
Kelvin.
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Light travels at 186,282.4 miles per second. That is in a vacuum. In other medium it appears to travel slower
but actually it is still traveling the same speed but moving through a crystal
like diamond it is bouncing, absorption, re-emission, all averages out to a
traverse speed of 77,500 miles per second.
However, it is all that bouncing around that gives the diamond that
dazzling sparkle.
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Eyeglasses correct vision because light slows down in glass or plastic
in the same way and its path is bent at the transition surface from air to
glass and back to air again.
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People glow in light, but, it is mostly infrared light. The glow is caused by the body’s free radical
chemical reactions.
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Much greater bioluminescence is common in creatures living in the
ocean. Apollo astronaut Jim Lovell used
this phenomenon to locate his darkened aircraft carrier that stirred up the
luminescence of this biology in its wake. (1954)
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Incandescent bulbs are very inefficient.
They only convert 10% of the energy to light. Most of the rest is converted into heat. A 100 watt bulb in a confined space can cook
at 325F. When I was living in Indiana my
55 Ford had to be outside. I put a light
bulb on top of the engine and it started right up every morning at below zero
temperatures. I was never tardy to 8:00
classes with a 20 mile commute in 3 years of college. Thanks to this technique.
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Light has no mass so it must always travel at the same , light
speed. Anything with no mass travels at
this speed, like muons. However, light
does have momentum and therefore has energy.
The energy of a photon is:
--
---------------------------- E = h*f
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------------------------- Energy
= 6.625 * 10^-34 kg*m^2/sec *
frequency
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Apollo astronauts left a mirror on the Moon. Laser beam measurements have determined that
the Moon’s orbit is moving outward from Earth at 1.5 inches per year.
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Our eyes see visible light. Fish
can see infrared light. Bees, birds, lizards can see ultraviolet
light.
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- Photography got its name from “photo” -
light , “graphy” meaning writing.
Writing with light.
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The Auroras light up the night sky because ionized particles from the
Sun crash into atmospheric molecules as the charged particles enter the north
tic pole. Oxygen shines green, nitrogen
shines blue and red.
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--------------------- Other reviews available upon request.
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#1389 - The sunlight hitting you is 45,000 times more
powerful than the radiation hitting you from the TV tower.
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- #1386
- If you were on the Moon you
could see a lightning strike in1.3 seconds after it happened. If the sound, thunder, could travel through
space you would not hear the thunder for 13 days. ( sound traveling at 750 miles per hour.)
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- #
1288 -
We take light for granted. Radio
and TV and microwave ovens, and cell phones all depend on the same
electromagnetic radiation. The
wavelengths of radio extend to miles. FM
radio wavelengths are at 9 to 11 feet.
Microwaves at 12 centimeters (4.7 inches)
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---------------------- red light
-------------0.7 * 10^-6 meters
--------------------- blue light
------------0.4 * 10^-6 meters
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Visible light occupies only 1 ten-billionth of the electromagnetic
spectrum.
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The photons that carry this wave energy in their momentum are traveling
at 670,633,500 miles per hour.
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Stand in front of a 60 watt light
bulb. This is how fast the photons are
hitting you. That is not the worst
part. There are
1,800,000,000,000,000,000,000 photons
hitting your body every second.
(1.8*10^20)
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#1286 - When you look at the stars some of those
photons hitting your eye took millions
of years to get to you Some left the
star before dinosaurs roamed the Earth.
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#1043 - Light travels one foot is a nanosecond (
10^-9 seconds) Your girl friend standing
20 feet away is 20 billionths of a second older than the image you see of her.
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#940 - The Sun is radiating 65,000,000 watts per
square meter per second.
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#934 - Each photon is an energy bundle. The higher the frequency the higher the
energy.
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E = h*f
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#726 - The force of an electric charge is 10^39
times greater that the force of gravity.
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#648 - Light is a physical symmetry for the entire
Universe.
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#550 - Light does not know time. Time stops at the speed it is moving. Light is the conversion factor between energy
and mass.
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#36 - What is the oldest thing you have ever
seen? No it is not the pyramids. Not even the dirt at your feet that cannot be
older than 4,500,000,000 years. You need
a telescope and your eyes can see photons that are 12,000,000,000 years
old. What you see is a young star but
today it is 12 billion years older than that.
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---
Some reviews are at:
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------------------------- Friday, June 1, 2018
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