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December 02, 2008

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what is solar flare ?

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Asked By: Anonymous |

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A flare is defined as a sudden, rapid, and intense variation in brightness. A solar flare occurs when magnetic energy that has built up in the solar atmosphere is suddenly released. Radiation is emitted across virtually the entire electromagnetic spectrum, from radio waves at the long wavelength end, through optical emission to x-rays and gamma rays at the short wavelength end. The amount of energy released is the equivalent of millions of 100-megaton hydrogen bombs exploding at the same time! The first solar flare recorded in astronomical literature was on September 1, 1859.

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Monday, January 21, 2008

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physics

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what is a photon ?

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Asked By: Anonymous |

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In physics, the photon is the elementary particle responsible for electromagnetic phenomena. It is the carrier of electromagnetic radiation of all wavelengths, including gamma rays, X-rays, ultraviolet light, visible light, infrared light, microwaves, and radio waves.

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Monday, January 21, 2008

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physics

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122

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What is the purpose of dental x-ray?

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Asked By: Anonymous |

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Dental x-rays are used to create detailed images of a patient's teeth and mouth. X-rays are often used to monitor tooth growth and development. X-rays reveal tiny pits of decay in the teeth that may not be evident during a visual examination. X-rays can also be used to detect decay under existing fillings or other dental restorations, as well as damage to such restorations and the following:

Abnormalities such as cysts, infections and both benign and malignant tumors
Bone abnormalities associated with diseases
Infection, death of the nerve or other problems associated with the teeth and bones
Injuries to the teeth or jaw (e.g., fractures)
Periodontal (gum) disease impacted teeth
Extra teeth

dental x-ray to help prepare and place dental restorations such as crowns, fillings, dental implants, and dentures.

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Wednesday, September 19, 2007

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image, dental, teeth, dental x-ray, mouth, decay, filling, cysts, infections, benign, malignant tumors, Bone abnormalities

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132

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What is proton therapy and how is it used?

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Asked By: Anonymous |

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Protons are atoms that carry a positive charge. Just as x-rays are used to treat both benign and malignant tumors, a beam of protons can be used to radiate tumors in the same way. There is essentially no biological difference between x-ray and protons, except that protons release most of their energy when they hit the tumor and deliver no exit dose beyond the tumor boundary. Therefore, the dose of radiation conforms to the tumor better and there is less damage to healthy tissue. As a result, the treating physician (a radiation oncologist) can give an even greater dose to the tumor while minimizing unwanted side effects. This is especially important when treating children, because it reduces radiation to growing and developing tissues.

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Wednesday, September 19, 2007

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atoms, tissue, tumor, proton therapy, radiation, positive, x-rays, radiation oncologist

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100

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At what speed does a Cosmic ray travel?

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Asked By: hotshot7 |

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Earth is continually pelted by high-energy particles coming mostly from beyond the solar system. These cosmic rays, as they are known, typically travel at speeds 90 to 99 percent that of light.

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Tuesday, October 16, 2007

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light, science, earth, cosmic ray, solar system, energy-partical

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