Physics P3

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• 2. In X-rays machine electrons are produced by the cathode, which is heated by a filament inside an efacuated tube (A vaccum tube), which accelerates electrons toward the anode, emeded in the anode is a tungsten target which converts some pe into x-rays (3, 2, 1, 4, 4)
• 3. Refraction is the change in the speed of light rays, altering the direction. (4, 2, 10)
• 4. 2 protons, 2 neturons - Relative mass of 4, heavily ionising, low penetration, and is affected by magnetic fields. (10, 2, 5)
• 5. No mass, nor charge, not directly ionising, very hight penetration. (10, 2, 5, 1)
• 6. Annihilation is when a positron and electron colide and transform into energy. (4, 2, 13)
• 7. The lens refracts light to focus onto the retina. This is adjusted by changing the thickness and curvature of a lens. (4, 4, 3, 4, 2)
• 8. Charge of -1, mas off 1/1840, weakly ionising, and has a low penetration. (10, 2, 4, 0)