2204356
Description
Flashcards by Khadijah Mohammed, updated more than 1 year ago
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Created by Khadijah Mohammed
almost 10 years ago
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| Question | Answer |
| Name 7 types of radiation in the electromagnetic spectrum | Radiowaves Microwaves Infrared Visible light Ultra - violet X-ray Gamma Ray |
| What 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. |
| What happens to the amount of energy photons contain as the frequency of their radiation increases? | Photon energy also increases. |
| Why 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 |
| How fast does electromagnetic radiation travel? | 300 million meters per second |
| What is intensity a measure of? | Intensity is how much energy is arriving per second per square meter |
| What two factors can increase the intensity of a beam of radiation? | Exposure time Distance |
| What 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. |
| Which electromagnetic radiations have enough energy to change atoms or molecules, so they initiate chemical reactions? | Ultra-violet, x-ray, gamma ray |
| What is the process called which does this? | Ionising radiation |
| How 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. |
| How 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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