25-04-2012, 10:49 AM
ENERGY TRANSFORMATIONS
raghu.ppt (Size: 45 KB / Downloads: 45)
Become Familiar with the following terms:
Types of Radioactive Decay:
Alpha Particle, : Has a +2 charge; the particle is composed of two protons and two neutrons; Is stopped by skin, tissue paper. These particles are not very energetic. The atomic number drops by two. It is sometimes written as a helium atom: He
Beta Particle, : Has a –1 charge; comes from a neutron being given off – the neutron gives off a beta particle (negative) and a proton (positive); the beta particle leaves and the proton stays in the nucleus. Metal foil stops this particle. The atomic number increases by one.
Uses of Radioactivity
Too much radiation can be lethal. You are exposed to radiation every day by watching television, standing in the sun, and even standing in your basement. The goal is to not get exposed to too much radiation. Too much radiation can result in cancer or other diseases. This happens when the radioactive substance causes damage to your DNA and chromosomes. This damage to the DNA is called mutations. This in turn causes changes in your cells.
Fuel/Electrical Source: The energy produced in nuclear reactions can be used as a fuel source. Fusion is the result of nuclei combining and giving off huge amounts of energy. This occurs in the sun. Fission is the splitting of an atom into two and releasing energy at the same time.
HEAT TRANSFER
This type of heat transfer requires no matter. Radiant heat is the transfer of energy by electromagnetic (infrared) waves. Examples of radiation are when you feel the heat from the fire or the sun’s heat on your face.
raghu.ppt (Size: 45 KB / Downloads: 45)
Become Familiar with the following terms:
Types of Radioactive Decay:
Alpha Particle, : Has a +2 charge; the particle is composed of two protons and two neutrons; Is stopped by skin, tissue paper. These particles are not very energetic. The atomic number drops by two. It is sometimes written as a helium atom: He
Beta Particle, : Has a –1 charge; comes from a neutron being given off – the neutron gives off a beta particle (negative) and a proton (positive); the beta particle leaves and the proton stays in the nucleus. Metal foil stops this particle. The atomic number increases by one.
Uses of Radioactivity
Too much radiation can be lethal. You are exposed to radiation every day by watching television, standing in the sun, and even standing in your basement. The goal is to not get exposed to too much radiation. Too much radiation can result in cancer or other diseases. This happens when the radioactive substance causes damage to your DNA and chromosomes. This damage to the DNA is called mutations. This in turn causes changes in your cells.
Fuel/Electrical Source: The energy produced in nuclear reactions can be used as a fuel source. Fusion is the result of nuclei combining and giving off huge amounts of energy. This occurs in the sun. Fission is the splitting of an atom into two and releasing energy at the same time.
HEAT TRANSFER
This type of heat transfer requires no matter. Radiant heat is the transfer of energy by electromagnetic (infrared) waves. Examples of radiation are when you feel the heat from the fire or the sun’s heat on your face.