Journal _ Week 3 August 12, 2008
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1. analyze why red sunsets can sometimes be more impressive when there is more dust or pollution in the air than usual.
Red sunsets can be more impressive and more stunning to view when there is more dust and pollution in the air because the light of the red sunset that passes through the clouds disperse into the primary clours of the sunset combining them with the original colours to define and make the sunset more impressive.
2. Describe what happens inside water droplets to cause a rainbow and explain how you can tell whether a rainbow is a primary or secondary.
In the droplets of rain light passes through them therefore disperses and creates a massive spectrum, otherwise known as a rainbow. The dispersion occurs because droplet acts like a clear prism and therefore making a dispersion occur for a spectrum to be formed.
Journal_Week 2 August 12, 2008
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Investigate the two types of sight defect- long-sightedness and short sightedness.
Find the following information:
- what causes the defect
The causes of the defect of Short sightedness and long sightedness are:
- If your cornea is too curved
- your eyeball too long
- You are more likely to develop it if it runs in your family
- You are more likely to develop myopia if it runs in your family
b. the symptoms displayed
The displayed symtomps of short and long sightedness are:
- Far objects become blurry but close objects are normal
- Far objects are clear and normal but close objects become blurry.
c. propose what sort of lens may be used to correct each vision
The sort of lens that can be used to correct this defect is a concave lens as the light is passed through is bent into the eye directly and clearly.
Journal_Week 1 August 12, 2008
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Fibre optic technology offers many advantages when used in medical applications.
a. describe how optical fibre may be used in medical applications
Optical fibers can used in medical applications for example endoscope. Doctors and practitioners use optical fibers as cameras to easily explore the problem. Optical fibers may also be used for communication. Optical fibers can transfer information using the law of internal refraction and so loosing only a limited amount of signal and information during the travel.
b. identify the traditional medical techniques that optical fibres might replace
One traditional medical method is the examination of the internal structure of the body fro example the doctor may need to look inside the persons body to check if everything is alright, so the doctors organizes an operation for the patient to cut the patient open and examine him like that. With optical fibers the doctor can just weave the optical fiber camera into, and around the person body and instantly see what he needs to see.
c. Evaluate the benefits of fibre optic technology to medicine
Optical Fiber is a major benefit to medicine because:
- It will be easier and safer for the doctor too look around the persons body.
- Video conferencing when another specialist doctor is need urgently, will be smoother and easier to conduct.
- easy way to transfer infomration and data around the hospital efficiently.
The Big Bang Timeline June 17, 2008
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The Big Bang is thought to be the phase in which our universe was created from. The Bi Bang was thougt to have happened 14 billion years ago. the matter that is spread around were mostly hydrogen and helium atoms which are the bases of our planets and stars. Here is a timeline in how the big bang occured.
Big Bang Timeline:
- ???- The big bang occurs
- 1 Billion Trillionth of a second – The first matter is dispersed (electrons and Quarks)
- 300 000 years ago – Hydrogen and Heluim atoms form
- 1 Billion years – the first Stars and Galaxies form
- 14 Billion Years – Current Universe
The Shapes of the Universe June 16, 2008
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There are several forms that a universe can have. There are flat, open and closed universes. I will explain each one of them.
Flat Universe:
Flat universes are a type of universe that stops expanding but does not reverse or contract into itself.
Open Universe:
An open universe is a type of universe that is has a low enough mass expands forever but at slowing a decreasing rate. Eventually, stars in galaxies will stop shining and this universe will become very cold and dark to to the fact that there is so much space in between stars and galaxies.
Closed Universe:
A closed universe is a type of universe that will eventually stop expanding but as well reverses. The retraction of the universe is caused by gravitational pull of matter. This contraction mat cause whole universe to collapse on itself which may then cause it to result of causing anither Big Bang starting the whole process again.
Journal 1- 3.3 Life of a Star June 4, 2008
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1 A nebula is a vast cloud of gas and dust in space.
2 The main fuel in stars is hydrogen.
3 Burns hydrogen, red giant, burns helium, white dwarf
4 The limited hydrogen fuel will run out and our Sun will expand to form a red giant and eventually collapse to form a white dwarf. A star with a mass of ten Suns uses up its fuel more rapidly and becomes a blue supergiant and then expands to form a red supergiant which collapses, causing a supernova, resulting in a neutron star.
5 A pulsar is a rapidly rotating neutron star with a strong magnetic field. It emits radio waves that sweep across space.
6 A black hole is formed by the collapse of a star the size of many Suns.
7 We cannot see black holes because light cannot escape from them. We know they exist because of the X-rays emitted by them, and the behaviour of nearby stars.
8 The elements were produced when stars collapsed.
9 Blue supergiant, red supergiant, supernova, neutron star
10 You could not lift it.
11 Our region of the galaxy rotates around (rather than falling into) the black hole.
12 Jocelyn Bell Burnell discovered pulsars in outer space in 1967 by actually chance! Her and Anthony Hewish were studying distant galaxies, when suddenly their telescope that was pointed in a certain point in the sky detected a pulsed signal. Fisrt scientist and astronemers thought of this signal tobe from an extra-terrestrial civilisation. When the signals were establisked that they were not from that origin, they called a pulsar as its signals are pulsed.
13
a) Black Holes: A black hole froms when a massive enough star collapses and it becomes even more dense than a neutron star to from a balck hole. It is o dense that even light cannot escape its gravity.
b) Some features that a black hole has are:
- Super strong gravity
- emits Tell-Tale X-rays
- Sucks up anything
