The Nature of Light
Thomas Young Theory.
Thomas Young was the first person to produce evidence on the wave
nature of light although he was not the first person to suggest that
light had a wave theory, this was also suggested by Christiaan
Huygens.
Experiment: Young’s double slit.
Thomas Young proposed that when two light beams interact they create
interference which can be constructive or destructive. The places
where constructive and destructive interference occur are subjected to
constant change, since electromagnetic waves emitted are capable of
varying phase. Using one light source and splitting it into two beams
you can create two coherent sources, meaning they are of identical
frequencies and have a constant phase difference.
The apparatus consists of a source matching the above requirements, a
screen with two very thin identical slits and a screen to view the
interference on.
In principle, a light bulb, or lamp can be used, but the light must be
reduced to a monochromic source with filters. It can also be done by
splitting the light into its various frequencies using a prism, a
frequency can be selected by channeling the light with a further
screen with only a pin prick in it to allow the light out. These days
lasers are used to provide the light source.
When the light is switched on, it travels up to the first screen and
is split into two beams by the slits, we have seen that when this
happens waves are diffracted and bulge outwards causing two curved
wave fronts to propagate the other side of the slits, at many places
between the slits and the viewing screen there are areas of
constructive interference and by moving the viewing screen it is
possible to get a picture of where they are occurring.
If we could calculate the intensity of the light along the screen (
this could be done by replacing the screen with a instrument such as a
photo-multiplier) we would see the following
Where the greatest intensity occurs at a point equidistant between the
The book All The Light We Cannot See by Anthony Doer, was not your traditional love and war story. It’s about a young blind girl named Marie growing up in the war, who had a connection with a young boy named Werner who is a part of the Hitler youth. There are a few other characters who are all in different parts of the world, and yet they eventually all meet up together and find out they all have some type of connection between each other. All of the characters in the book were affected by the war, and caused them to change into the characters that they ended up to be.
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In 1998 a Maryland neurologist, Dr. Christopher Newman, was diagnosed with brain cancer and he could no longer work as a result of his disease. He claimed that the Motorola cell phone he had in 1992 to keep in touch with his patients gave him cancer. Then in 2000, he filed an $800 million lawsuit against several wireless providers including Motorola Inc., Verizon Communications Corp., Bell Atlantic Mobile Systems, and others. Within a month, the U.S. District Judge Catherine Blake dismissed the case due to lack of evidence. This case happened during a time where people were confused about how electromagnetic radiation affects the human body. Fast-forward to today and there is still confusion. A lot of people today feel like they are at risk from developing cancer from electronic devices like cell phones, microwaves, and laptops. That is simply not true.
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