Radioactive Materials 3.5 / 5 based on 2 ratings ? PhysicsRadioactivityGCSEOCR Created by: Aisling GallagherCreated on: 18-10-15 17:55 What is the smallest part of an element? Atom 1 of 37 Where is the mass of an atom mainly concentrated? The Nucleus 2 of 37 What is the weight of an Electron? 1/1840 3 of 37 What happens to alpha particles passing close to a nucleus? They are deflected 4 of 37 What holds protons and neutrons in the nucleus together? A strong nuclear force 5 of 37 What is an 'Isotope?' A form of an element which has different neutrons to the most commonly found form. 6 of 37 What does ionising radiation do? Knocks out electrons from atoms and forms a positive ion. 7 of 37 What percentage is the background radiation of gamma from rocks? 13% 8 of 37 Radioactivity is... Random 9 of 37 The amount of radiation emitted is dependant on... The amount of the radioactive element present 10 of 37 What is gamma radiation? An electromagnetic wave 11 of 37 What is radiation measured in? Sv 12 of 37 What can ionising radiation do humans? Cause radiation sickness 13 of 37 What does low-intensity radiation do? Cause cell mutations that lead to cancer 14 of 37 What is alpha radiation? Large, highly ionising and can't pass through the skin 15 of 37 Beta and Gamma are... Highly penetrating 16 of 37 What charge is alpha? 2+ 17 of 37 What mass is Beta? Very light 18 of 37 What range (in air) does Beta have? 1m 19 of 37 What frequencey do gamma rays have? Very High 20 of 37 What do ions do? Interfere with the structure of DNA 21 of 37 What happens when a radioactive nucleus emits alpha or beta? The number of protons and neutrons changes 22 of 37 What does the activity of a radioactive sample depend on? Number of unstable nuclei present 23 of 37 What is the half-life of a radioisotope? The time taken for half of all the atoms to decay 24 of 37 What is the method called for treating cancer with radiation? Radiotherapy 25 of 37 What radiation is used to treat cancer? Gamma 26 of 37 Why is food zapped with gamma last? So that other bacterium don't get in and multiply 27 of 37 what is used for detecting tumours? Radioactive tracers 28 of 37 What triggers smoke alarms? Carbon particles turn the alpha source into a He atom 29 of 37 On a paper thickness guage, what will happen to the radiation if the sheet becomes thicker? It will decrease 30 of 37 What do PET scans for active cancers detect? Increased Glucose 31 of 37 What is a Hazard? Anything which may cause harm 32 of 37 What is the main isotope in food? K-40 33 of 37 What do film badges do? Monitor radiation 34 of 37 Fission... Causes an atom to split 35 of 37 What force attracts the protons and neutrons? Strong Nuclear Force 36 of 37 What does the 'm' mean in E=mc2 Mass lost during fission 37 of 37
Comments
No comments have yet been made