Category Archives: physics 9

Radioactive Decay

Radioactive isotopes of elements have unstable arrangement of neutrons and protons in their nuclei. To become more stable, they emit alpha or beta particles. But this changes the number of protons and neutrons in the nucleus resulting in the formation … Continue reading

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Sources of Nuclear radiation

  Nuclear radiation can damage or destroy living cells or make cells grow abnormally causing cancer. The most dangerous is radiation caused by radioactive materials absorbed by┬áthe body. Radioactive gas and dust may be taken into the body along with … Continue reading

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Nuclear Radiation

Discovery: Henry Becquerel discovered radioactivity accidentally in 1896.   Nuclear radiation: Some elements contain atoms with unstable nuclei. With time, the unstable nucleus disintegrates. While doing so, it shoots out a tiny particle and sometimes wave energy as well. Since … Continue reading

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Conduction

  1. Explain the process of conduction. 2. Give three conditions that will make the transfer of thermal energy from one end of a metal bar to the other end faster. 3. Poor conductors are called ___________. 4. ____________ are … Continue reading

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The Gas Laws

  1. In gases, a change in temperature can produce a change in _________ & __________. 2. What happens at the molecular level when the temperature of a gas is increased? 3. As the temperature of a gas rises, its … Continue reading

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