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int 2 waves + optics
physics waves and optics unit
| Question | Answer |
|---|---|
| how do you measure speed? | speed=distance divided by time .. v=d/t |
| give an example of a longitudinal wave? | sound wave. |
| give an example of a transverse wave? | water wave or any wave in the electric magnetic spectrum. |
| what is the difference between transverse and longitudinal waves? | transverse- the particles vibrate and 90 degrees to the movement of energy longitudinal- the particles vibrate the same way as the energy transfer |
| name the order of the electric magnetic-spectrum from high energy to low energy? | gamma rays; x-rays; ultra-violet; visible light; infra-red; microwaves; tv + radio waves. |
| what is the speed of light? | 300000000m/s |
| what is the amplitude of a wave? | the distance from the centre line to the top of the wave. |
| what is the top of the wave called? | crest. |
| what is the bottom of a wave called? | trough. |
| what is the wave length? | the distance between one point on a wave to the corresponding point on the next wave. |
| what is the period of a wave? What is it measured in? | the time take for one wave to pass a point and is measured in seconds. |
| what is the symbol for period? | T. |
| what is the frequency of a wave and what is it measure in? | the number of waves that pass a point in a second and is measured in hertz Hz |
| how to you calculate period | period= 1/frequency |
| what is the angle of incidence equal to? | the angle of reflection. |
| where is the normal line? | at right angles to the mirror. |
| what is refraction? | the change in speed of light when light enters different materials. |
| what will happen when light changes material? | - change speed - change direction |
| what happens when the incident angle is increased above the critical angle? | total internal reflection. |
| what is an optical fibre? | a long thin flexible piece of glass |
| why does light not escape from an optical fibre? | total internal reflection. |
| what type of lens causes converging rays of light? | convex |
| what does a concave lens do? | causes diverging rays of light. |
| what unit is optical power measured in? | Dioptres (D) |
| what is focal length measure in> | meters (m) |
| what lens is used to correct short sight? | concave |
| what lens us used to correct long sight? | convex. |
Created by:
gayjay
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