20625842
Description
Flashcards by Caoimhe Basketter, updated more than 1 year ago
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Created by Caoimhe Basketter
over 4 years ago
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| Question | Answer |
| what are the two types of lenses? | -converging/convex -diverging/concave |
| why does light refract? | light refracts because one edge of the wave front first and either speeds up or slows down. |
| what happens when light goes into a medium with a different optical density? | it gets refracted (unless it hits perpendicular) |
| what is the ionosphere? | a region of the atmosphere around 100km high, -reflects radio waves -does not reflect microwaves |
| what are S-waves? | transverse waves produced by earthquakes -can only travel through solids |
| what is a transverse wave? | a wave in which the particles vibrate perpendicular to the direction of travel |
| what is an example of a transverse wave? | -any EM wave -water waves - S-waves |
| what are the two types of waves? | -longitudinal -transverse |
| what is the relationship between the angle of incidence and the angle of reflection? | they are the same |
| why can you not see your reflection in everything? | because when light is reflected of a rough surface it scatters in all directions |
| what is amplitude? | the distance from the line of equilibrium to the peak/ the maximum distance each point moves from the normal |
| what is the speed of light? | 3x10^8 m/s 300 000 000 |
| what equation connects: -time -speed -distance | speed = distance / time |
| what is a longitudinal wave? | a wave in which the particles vibrate parallel to the direction of the wave |
| what equation relates: -period -frequency | time period = 1/frequence |
| what is an example of a longitudinal wave? | -sound waves - P-waves |
| what is wavelength? | the distance between two similar points on a wave, such a peak to peak |
| what is the unit of frequency? | hertz (Hz) |
| what is frequency? | the amount of waves/wavelength past a point in a second |
| what are P-waves? | longitudinal waves produced by earthquakes -can travel through solids and liquids |
| list the EM spectrum, starting with lowest energy | -radio -microwaves -infrared -visible -ultra violet -x ray -gamma ray |
| when would sound be refracted? | when travelling through areas with different temperatures, -cold air = slower -hot air - faster |
| why do things appear coloured? | depending on which wavelengths of light are absorbed and which are reflected |
| what is the range of average human hearing? | 20 Hz-20 kHz |
| what equation connects: -wave speed -frequency -wavelength | wave speed= frequency x wavelength |
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