P2 - Radiation and Life

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  • Radiation and Life
    • Electromagnetic Radiation
      • Light is a type of electromagnetic radiation. Radiation is a transfer of energy.
      • Visible light is the colours of the rainbow red-violet this is the radiation that our eyes can detect. Radiation closer to the red direction is called infrared and closer to the violet direction is called ultraviolet.
        • Photon energy increases as you go along the electromagnetic spectrum. Radio wave photons have the lowest frequency and lowest energy where as gamma ray photons have the highest frequency and most energy
      • There are seven types of radiation making up the electromagnetic spectrum - radio waves, microwaves, infrared, visible light, ultraviolet, x-rays and gamma rays.
      • You can feel warmth from the sun because heat energy is traveling through space as infrared radiation.
      • Energy is delivered in photons. A photon is a tiny bit of energy.
      • Photons carry tiny pieces of energy. The amount of energy carried by the photon depends on the frequency of the radiation.
    • Ionisation
      • If your body cells are exposed to ionising radiation the damage to DNA molecules can cause mutations and they might start dividing over and over again without stopping - this is cancer.
      • It takes a lot of energy to remove an electron from an atom or molecule. Only types of radiation with high energy photons can cause ionisation e.g. ultraviolet, x-rays and gamma rays. Called ionising radiation. some substances (radioactive materials) emit ionising gamma radiation all the time
      • The changed atom or molecules can go to initiate other chemical reactions.
      • Al substances are made up of atoms and molecules. A photon hits an atom or molecule it has enough energy to remove an electron and change the atom or molecule this is Ionisation
      • Very high doeses of radiation can kill your cells all together this can lead to sunburn or more seriously skin cancer.
    • EM waves and communication
      • Radio waves and microwaves are good at transmitting information over long distances. Because they don't get absorbed  by the earths atmosphere as much as waves in the middle of the spectrum.
      • Radio waves are used for tv and fm radi transmissions have very short wavelengths
      • Communication to and from satellites uses microwaves that can pass easily through the atmosphere.
      • Satellite dishes are made of metal, metal reflects microwaves well, so the dish can focus the waves onto it's reciever, rather than just absorbing them.
  • Ionisation
    • If your body cells are exposed to ionising radiation the damage to DNA molecules can cause mutations and they might start dividing over and over again without stopping - this is cancer.
    • It takes a lot of energy to remove an electron from an atom or molecule. Only types of radiation with high energy photons can cause ionisation e.g. ultraviolet, x-rays and gamma rays. Called ionising radiation. some substances (radioactive materials) emit ionising gamma radiation all the time
    • The changed atom or molecules can go to initiate other chemical reactions.
    • Al substances are made up of atoms and molecules. A photon hits an atom or molecule it has enough energy to remove an electron and change the atom or molecule this is Ionisation
    • Very high doeses of radiation can kill your cells all together this can lead to sunburn or more seriously skin cancer.

Comments

Miss KHP

Great information and colour used! Well done! Perhaps condense some of the longer parts, but overall great! 

Good for P2 OCR

kathrynbradbeer

really good and helpful and I love the use of colour!

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