What is 5 mSv in Sv - 0.005 Sv, What is 1900 MHz in Hz - 1900,000,000 Hz, What happens to a ray of light when passing from air to glass. - Angle of refraction is less than the angle of incidence., Explain refraction with the aid of a diagram. - When a ray changes speed on entering a medium with a different density, Explain how a rainbow is formed using the terms: refracted, colour spectrum, ROYGBIV, split up. Also include a diagram - White light from the sun is refracted by rain droplets causing the light the split up in a colour spectrum (ROYGBIV)., Absorbed dose units - Gy (1 Joules/kg), Define absorbed dose - The energy of the radiation absorbed per unit mass of tissue, Write the equation linking absorbed dose, energy and mass - D=E/m, State the units of volume - m3, Draw a particle diagram for a solid - teacher to draw on board…, Draw a particle diagram for a liquid - teacher to draw on board…, State Newton's Second Law - Force = mass x acceleration (The acceleration of an object is proportional to the resultant force acting on the object, and inversley proportional to the mass of the object), What must be drawn to solve force problems - A freebody diagram, How do you find the unbalanced force from a free body diagram - total forces on either side and take away from each other, Reasons for absorption spectrums - Gas particles in space can absorb some wavelengths causing gaps,

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