Physics | Unit 4 | Additional Science 0.0 / 5 ? SciencePhysicsGCSEOCR Created by: A♥Created on: 04-06-13 16:38 How is Radiation measured? By the number of nuclear decays emitted per second 1 of 31 What is alpha radiation? Radiation with a helium nucleaus 2 of 31 Why is static electricity a problem for flour mills? Flour mills have a high concentration of fine particles so a single spark could lead to an explosion. 3 of 31 Why can Static Electricity become a nuisance? It makes clothes stick to your skin, and can cause dust particles to stick to insulating materials like TV screens 4 of 31 What colour is the neutral wire in a plug socket? Blue 5 of 31 How do body scans involving ultrasound waves work? Ultrasound waves are reflected at boundaries. The time taken for these to be detected can be used to calculate the depth. 6 of 31 What is resistance? The measure of how hard it is to get a current throught a component at a particular voltage 7 of 31 What do Anti-Static spray do? prevent the transfer of charge 8 of 31 What is a circuit? A complete loop that allows electric current to flow 9 of 31 How do you discharge static electricity? Earth it 10 of 31 What happens when an alpha particle is emitted from a nucleus? The atomic number decreases by 2 and the atomic mass decreases by 4 11 of 31 What are some uses of ultrasound? Body Scans and breaking down kidney stones 12 of 31 Name 3 uses of static electricity... Defibrillators, smoke detectors and spray painting 13 of 31 How do ultrasound waves break down kidney stones? They make them vibrate, disperse and break up so they're easier to pass through urine 14 of 31 How do Defibrillators work? The charge is discharged through the patient making the hearts contract 15 of 31 What is half-life? The time taken for the number of nuclei in the sample to half 16 of 31 What are tracers used for? Finding, leaks/blockages/routes of pipes and for searching through rubbish 17 of 31 What happens when a beta particle is emitted from the nucleus? Atomic Mass is the same, Atomic Number increases by 1 18 of 31 What is Beta radiation? A fast moving electron 19 of 31 What do radioactive materials give out from their nucleus's? Nuclear Radiation 20 of 31 Which wire is brown? Live Wire 21 of 31 What is ultrasound? Sound waves above 20,000 hertz 22 of 31 What is gamma radiation? An electromagnetic wave 23 of 31 What colour is the earth wire? Green and Yellow 24 of 31 What is resistance measured in? Ohms 25 of 31 In fisson, what does the nucleus split up into? Barium and Krypton 26 of 31 What is the energy source for nuclear power stations? Uranium 27 of 31 How can we gives rocks a name? Measure the amount of radioactive uranium and lead inside 28 of 31 Why must tracers have short half-lives? So the patient isn't radioactive for long 29 of 31 Where's the majority of background radiation from? The soil 30 of 31 What is the affects the amount of background radiation? Cosmic rays and rocks in the area 31 of 31
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