What is 5 micrometres in metres? - 0.000,005 m, What is 45 micrometres in metres? - 0.000,045 m, Angles are measured from what two points - normal and the ray of light, What is meant by refraction in terms of wave speed? - Change in wavespeed when waves pass between media which causes light to change direction, What is the angle of refraction - angle between ray and normal after passing into a material, Effects of long term exposure to radiation - Radiation can cause changes in DNA which can induce cancer. Cancer is considered by most people to be the primary health effect from radiation exposure. Damage occurring at the cellular or molecular level, can disrupt the control processes, permitting the uncontrolled growth of cancer cells., Effect of short term exposure at high levels of radiation - 'acute' exposure to radiation usually appears quickly. Acute health effects include burns and radiation sickness. It can cause premature aging or even death. If the dose is fatal, death usually occurs within two months. The symptoms of radiation sickness include: nausea, weakness, hair loss, skin burns or diminished organ function., Describe a use in medicine of radiation - Nuclear radiation can be used in medicine to sterilise instruments by killing germs and bacteria. It can also be used to kill the cells which make up a cancerous tumour, however, care must be taken not to kill or damage healthy cells. Nuclear radiation can also be used to examine the body using a radioactive tracer. These are substances that are injected into the body where they concentrate in the organ to be examined. The tracer emits gamma rays which are detected outside the body using gamma cameras., How would we increase pressure if the force remains constant. - Decrease the surface area , How would we decrease pressure if the force remains constant. - Increase surface area (eskimo shoes), How would we decrease pressure if the area remains constant. - Reduce force applied, Calcuating the gradient of a velocity time graph gives the … - acceleration, Calculating the area under a velocity time graph gives the … - displacement, How would you resolve vectors at right angles - Draw a vector diagram top to tail starting with the largest vector, use pytahgoras to find the hypotensue (resultant), use SOHCAHTOA to find the angle on the inside., What is a continuous spectrum? - Spectrum containing every wavelength of light.,

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