GCSE Physics

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The flashcards below were created by user ghoran on FreezingBlue Flashcards.

1. the line joinig the object to the image is at
right angles to the mirror
2. the image in the plane mirror is
laterally inverted
3. the image in the plane mirror is ....... and the same sizes as the object
virtual
4. the image is as far behind the mirror as
is in front
5. ....... are examples of sound being reflected
echoes
6. what is refraction
it is when rays of light direction when they cross the boundary between two one trasnparent substance and an another
7. if a light waves hits a bounday face on it : i.e. if the ray meets the boundary ar right angles (along the normal)
carries on in the same direction i.e. it does not refract
8. if a wave meets a different medium at an angle the wave
changes direction - it has been refracted
9. light travels more slowly in glass , as the light is slowed down it changes direction and is refracted ........ the normal
towards
10. when light leaves glass , it speeds up and is refracted ...... from the normal
away
11. in refrcation the angel of incidence =
the angel of the emergant ray if the block is rectangular
12. the angel of inciendence is ..... than the angel of refraction
larger
13. refraction the incident ray should be ......... to the emergant ray if the block is regtangular
parralel
14. tagaga
• towards (towards the normal) air -> glass
• away (from the normal) glass -> air
15. what happens to the speed of the light ray when it passes from glass to air
it increases
16. sound waves travel through solids , liquids , and gases as ...... waves
longitudinal
17. sound waves travel ..... ... than light waves
more slowly
18. sound are produced when
obejcts vibrate
19. sound waves ....... travel through a vacuum
cannot
20. the higher the frequency the
higher the pitch
21. the bigger the amplitude the
louder the sound
22. most children can hear sounds in the range from about
20 Hz to 20,000 Hz
23. diffraction happens
when a wave meets a gap in a barrier or an obstacle , they carry on through the gap , however , the waves spread out to some extent into the area beyond the gap . this is called diffraction
24. wide gap = ......... diffraction effect
small
25. narrow gap = ...... diffraction effect
large
26. large wavelength = .....
diffraction
27. significant diffraction only occurs when
the wavelength of the wave is of same size as the width of the gap or size of the obstacle
28. what doesnt change when a wave is diffracted
the speed and wavelength of the wave
29. how many hertz is a kilohertz
1,000
30. how many hertz is a mega hertz
1,000,000 hertz
31. how many hertz is a gigahertz
1,000,000,000 hertz
32. wave speed is measured in
metres per second m/s
33. frequency is measured in
hertz , Hz
34. wavelength is measured in
metres , m

Card Set Information

 Author: ghoran ID: 150852 Filename: GCSE Physics Updated: 2012-04-29 06:01:52 Tags: use waves communication provide evidence that universe expanding Folders: Description: gjhh Show Answers:

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