Whenever you watch
TV, send a text message, or heat food in a microwave you are using waves. Some
waves like sound waves, need molecules to travel through. This is why you can
hear sound in our atmosphere but not in space. Some waves however, do not need
molecules to travel. These waves are called electromagnetic waves. There are
many types of waves along the electromagnetic spectrum, from very long radio
waves to very short gamma rays. They differ from each other in wavelength.
Wavelength is the distance between one wave crest to the next. Electromagnetic spectrum is made up with radio waves, microwaves,
infrared (IR), Visible light, ultraviolet (UV), X-rays and gamma-rays. Earth’s
atmosphere allows this region of the electromagnetic spectrum to pass through
largely unattenuated.
***
Radio waves:
Radio waves have the longest wavelengths in
the electromagnetic spectrum. They can be as large as a football ground to
larger than our planet. They have the lowest frequency of all the
electromagnetic waves. Radio waves can be used for televisions, radio stations.
Microwaves:
Microwaves
are higher frequency than radio waves. They range in size from about 1
millimeter (that’s about the size of a sharp pencil point) to about 1 foot
long. You are probably most familiar with them when you heat your food up in a
microwave, but they have a lot more uses including weather forecasting and cell
phones. Microwaves can even pass through clouds, which make them an excellent
wavelength for transmitting satellite communications.
Infrared waves:
A remote
control uses light waves just beyond the visible spectrum of light- Infrared
light waves – to change channels on your TV. Infrared energy can reveal objects
in the universe that cannot be seen in visible light using optical telescopes.
Many objects in space are also too cool and faint to be detected in visible
light but can be detected in the infrared.
Visible light:
Visible light falls in the range of the EM spectrum between infrared (IR) and ultraviolet
(UV). Visible light is the portion of the electromagnetic spectrum
that is visible to the human eye. Electromagnetic radiation in this range of wavelengths is often simply
referred to as "light". A typical human eye will respond to
wavelengths from about 390 to 750 nm.
Visible
light waves are the only electromagnetic waves we can see. We see these waves
as the colors of the rainbow. Each color has a different wavelength. Red has
the longest wavelength and violet has the shortest wavelength. When all the
waves are seen together, they make white light.
Ultraviolet
wave:
Ultraviolet (UV) light has shorter wavelengths than visible light. Ultraviolet light is an electromagnetic radiation with a wave length from 400 nm (750 THz) to 10 nm (30 PHz), shorter than that of visible light but longer than X-rays. Although under some conditions children and young adults can see ultraviolet down to wavelengths of about 310 nm and people with aphakia (missing lens) can also see some UV wavelengths, ultraviolet is invisible to most humans. Though some ultraviolet waves from the Sun penetrate Earth's atmosphere, most of them are blocked from entering by various gases like Ozone. UV is visible to some animals such as bumblebees, reptiles and some birds can see them.
X-rays:
X- rays
have much higher energy and much shorter wavelengths than ultraviolet light. X
rays have very small wavelengths, so small that some x rays are no bigger than
a single atom of many elements. When you get an x-ray taken, x-ray sensitive
film is put on one side of your body, and x-rays are aimed through the other
side of your body. Bones contain much calcium,
which due to its relatively high atomic number absorbs x-rays efficiently. This reduces the amount of
X-rays reaching the detector in the shadow of the bones, making them clearly
visible on the radiograph. The lungs and trapped gas also show up clearly
because of lower absorption compared to tissue, while differences between
tissue types are harder to see.
Earth’s atmosphere blocks x-rays radiation.
This is beneficial for us here on Earth, because x-rays are so energetic that
they would harm almost every living thing on earth. Telescopes with x-ray
detectors must be positioned above Earth’s atmosphere. Such measurements can
provide clues about the composition, temperature and density of distant
objects.
Computed tomography (CT scanning) is a medical imaging modality where tomographic images or slices of specific areas of the body are obtained from a large series of two-dimensional X-ray images taken in different directions. These cross-sectional images can be combined into a three-dimensional image of the inside of the body and used for diagnostic and therapeutic purposes in various medical disciplines.
Computed tomography (CT scanning) is a medical imaging modality where tomographic images or slices of specific areas of the body are obtained from a large series of two-dimensional X-ray images taken in different directions. These cross-sectional images can be combined into a three-dimensional image of the inside of the body and used for diagnostic and therapeutic purposes in various medical disciplines.
Gamma
rays:
Gamma rays
have the smallest wavelengths and the most energy of all the waves in the
electromagnetic spectrum. They are produced by the hottest and most energetic
objects in the universe, such as supernova explosions(the way massive stars die)** and black holes. On
earth, gamma waves are created by nuclear explosions, lighting and radioactive
decay. Exposure to these high energy waves can cause damage to cells in living
things. Gamma radiation is used to kill cancer cells. Gamma rays bursts are the
most energetic and luminous electromagnetic events and can release more energy
in 10 seconds than our sun will emit in 10 billion years. Gamma rays are ionizing
which means that they have such high energy that can knock electrons out of atoms.
** (Supernovas can briefly outshine entire galaxies. They're also the primary source of heavy elements in the universe. According to NASA, supernovas are 'the largest explosion that takes place in space.')
Our
vision process:
When
visible light (400 nm–700 nm) strikes on retina, it's
converted into an electric signal that is relayed to the brain via the optic
nerve. The brain then translates the electrical signals into the images a
person sees.
There are around 100 trillion places
in the brain, known as synapses, where chemical processes occur. Any bodily
cell can establish a connection with 1,000 separate brain cells by utilizing
these synapses. The speed of the resulting information processing is truly
amazing—one single data byte can reach 100,000 neurons at the same time. As a
result, the brain functions hundreds of thousands of times faster than the most
advanced computer. Dr Kerry Bernstein, IBM’s director of technology, has said
that it does not seem possible to make a similar device with the same speed and
characteristics.
If you look at the face of your friend just for few
second, hundreds of billions of processes take place in your eye. In the case
of visual perception, the brain tracks the millions of signals coming from the
retina in order to assemble and update a dynamic model of the spatial structure
of the environment. This model is inferred from light patterns hitting the 100
million photoreceptors in the retina of the eye. By the time the visual signal
gets to the brain, it has already gone through multiple layers of neural
circuit processing and been reduced to 1 million fibers in the optic nerve,
each corresponding to something like a "pixel" in a digital
photograph.
These processes take place in the darkness of our skeleton. Our brain
has never seen visible light during its life time. Vision is output process of
our brain. Brain creates image which we call vision. Our Creator Allah has
programmed our brain to process only a slice of electromagnetic spectrum
i.e. visible light (400 nm – 700 nm** wavelength
and 790 THz – 430 THz*** Frequency (Hz))
If a slightly higher level of
infrared and ultraviolet, gamma, and micro rays allowed through, all living
things would cease to exist. Atmosphere shield has protected Earth for billions
of years from these rays’ deadly effects.
If Allah had programmed our brain to process -
1 mm – 1 meter wavelength and 300 GHz – 300 MHz Frequency
of electromagnetic spectrum we could listen every cell phone conversation without the help of cell phone.
If Allah had programmed our brain to process-
1 nm to 1oo,000 km wavelength and 300 GHz to 3 Hz Frequency of electromagnetic spectrum we
could listen every radio broadcasting without the help of radio and we could
see every broad casting of television channel without any TV set.
If Allah had programmed our brain to process-
0.01 nm–
10 nm wavelength and 30 EHz – 30 PHz
Frequency
of electromagnetic spectrum we could see bone and flash of our
body without X-ray machine.
If Allah had programmed our brain to process-
less
than 0.01 nm wavelength and more than 30 EHz Frequency
or
zetahertz
(ZHz) Frequency
or
yotahertz
(YHz) Frequency
we
could see many invisible creation of Allah which we can’t see now.
الله سبحانه وتعالى
**nm = nenometre- equal to one billionth of a metre
***
1
|
Kilohertz - kHz is defined as thousands of cycles per second.
|
2
|
Megahertz - MHz is defined as millions of cycles per second.
|
3
|
Gigahertz - GHz is defined as billions of cycles per
second
- 1GHz to 100GHz range.
|
4
|
Terahertz - THz is defined as trillions of cycles per
second
|
5
|
One petahertz - one followed by 15 zeros, or more
formally,
One One Petahertz
PHZ = 1 x 1015
|
6
|
One exahertz - one followed by 18 zeros, or One EHZ = 1
x 1018
|
7
|
One zetahertz -one followed by 21 zeros, or One ZHz = 1
x 1021
|
8
|
One yotahertz - one followed by 24 zeros, or One YHz = 1
x 1024
|
