Karteikarten
Physics 2
Karten in diesem Stapel (12)
- 1Name 7 types of radiation in the electromagnetic spectrumRadiowaves
Microwaves
Infrared
Visible light
Ultra - violet
X-ray
Gamma Ray - 2What are photons?Tiny packet of electromagnetic radiation. All electromagnetic waves are emitted and absorbed as photons. The energy of a photon is proportional to the frequency of the radiation.
- 3What happens to the amount of energy photons contain as the frequency of their radiation increases?Photon energy also increases.
- 4Why are the seven types of radiation usually listed in a specific order?They are listed from the lowest frequency to the highest frequency.
For example, radio wave photons have the lowest frequency and the least energy, and gamma ray photons have the highest frequency and the most energy - 5How fast does electromagnetic radiation travel?300 million meters per second
- 6What is intensity a measure of?Intensity is how much energy is arriving per second per square meter
- 7What two factors can increase the intensity of a beam of radiation?Exposure time
Distance - 8What happens to the intensity of radiation as the distance of the source is increased? What causes this?The intensity decreases with distance because the photons spread out and some of them are absorbed.
- 9Which electromagnetic radiations have enough energy to change atoms or molecules, so they initiate chemical reactions?Ultra-violet, x-ray, gamma ray
- 10What is the process called which does this?Ionising radiation
- 11How does ionising radiation take place?At a higher energy, it can destroy the nucleus of an atom. This means that when ionizing radiation passes through the tissues of the body, it actually has enough energy to damage DNA. It's why gamma rays, for example, are good at killing cancer cells through radiation treatment. Ionizing radiation is given off by radioactive material, very high-voltage equipment, nuclear reactions and stars.
- 12How can microwave radiation damage living cells?When you make a call on your phone, the phone emits microwave radiation. Some of this radiation is absorbed by your body , and causes heating of your body tissues (which all contain water)
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- Karteikarten am Physics 2 , erstellt von Khadijah Mohammed am 06/03/2015.
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