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Question

Expanding Universe<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />

1.    What is a particle accelerator? is a device that uses electromagnetic fields to propel charged particles to high speeds and to contain them in well-defined beam]
How do scientists use particle accelerators to study subatomic particles?

2.    What particle is exchanged to generate each of the four fundamental forces?

3.    What medical technologies (e.g. PET) rely on the physics of elementary particles?
What are the benefits of noninvasive procedures such as PET?

4.    How is astronomy the oldest science?

5.    How does the energy produced at the core of the Sun reach the photosphere?

6.    Why won

Explanation / Answer

1) A particle accelerator causes subatomic particles such as protons to collide forcefully with each other. When the particles break up, scientists can get a quick look at the resultant parts, which are tiny objects called quarks. Scientists hope that by studying quarks they can understand the state of matter at the beginning of the universe.

2) gluons

3) Medical technologies using emission particles:

x-ray radiation : Canxer treatment

Magnetic Resonance Imaging (MRI)

PET helps physicians:

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