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physics - radioactivity revision

カード 17枚 作成者: Lauren-Eden Penn (作成日: 2014/10/03)

  • what is at the centre of an atom?

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  • 1

    what is at the centre of an atom?

    補足(例文と訳など)

    答え

    • nucleus

    解説

  • 2

    what does the nucleus do and what is it made of?

    補足(例文と訳など)

    答え

    • it is the control centre of the cell and is made of protons and neutrons

    解説

  • 3

    what is half life?

    補足(例文と訳など)

    答え

    • the time taken for the numbet of radioactive nuclei in a sample to decrease by 50%

    解説

  • 4

    what are three natural causes of radiation?

    補足(例文と訳など)

    答え

    • - radon gass from the ground - buildings and the ground - food and drink -cosmic rays

    解説

  • 5

    what are two example of artificial radiation?

    補足(例文と訳など)

    答え

    • -medical uses -nuclear power and weapon test

    解説

  • 6

    what where the names of the 5 people involved with the model atom? include dates

    補足(例文と訳など)

    答え

    • democritus - 400bc Dalton - 1800's Thomson - 1897 Rutherford - 1909 Bohr - 1915

    解説

  • 7

    what is an isotope?

    補足(例文と訳など)

    答え

    • atoms of the same element that uave the same number of protons but different numbers of neutrons

    解説

  • 8

    what is radioactive decay?

    補足(例文と訳など)

    答え

    • the random process when the nuclei of isotopes break down. when it decays it splits into two and spits out one or more type of radiation

    解説

  • 9

    what are alpha particles made of?

    補足(例文と訳など)

    答え

    • 2 protons and 2 neutrons making them big, heavy and slow moving

    解説

  • 10

    what is an alpha particles penetration power?

    補足(例文と訳など)

    答え

    • easily absorbed by a few cm of air

    解説

  • 11

    what is the effect of emiting an alpha particle?

    補足(例文と訳など)

    答え

    • decreases the atomic number of the nucleus by 2 and the mass by 4

    解説

  • 12

    what are beta particles made of?

    補足(例文と訳など)

    答え

    • an electron emmitied from a nucleus. are quite fast and small

    解説

  • 13

    what is the penetration power of a beta particle?

    補足(例文と訳など)

    答え

    • stopped by 3mm of air all aluminium

    解説

  • 14

    what is the effect of a beta particle?

    補足(例文と訳など)

    答え

    • the atomic number increases by one but the mass number stays the same

    解説

  • 15

    what are gamma rays?

    補足(例文と訳など)

    答え

    • very short waves

    解説

  • 16

    what is the penetration power of gamma rays?

    補足(例文と訳など)

    答え

    • reduced by thick led or concrete

    解説

  • 17

    what effect do gamma rays have?

    補足(例文と訳など)

    答え

    • no effect

    解説

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