Flashcards
GCSE Core Waves
Flashcards do conjunto (33)
- 1all waves transfer... no waves transfer...energy
matter - 2which waves are part of the electromagnetic spectrum?radio
micro
infra red
visible light
UV
gamma
x rays - 3what is frequency?the number of waves produced/past a point per second. measured in Hertz (Hz)
- 4describe a transverse wave
- 5describe a longitudinal wave
- 6What is a transverse wavethe particles move at right angles to the direction the energy movement
- 7what is a longitudinal wave?particles oscillate the same direction as the energy transfer
- 8what is the wave speed equation?wave speed = frequency x wavelength
- 9how do sound waves and light waves diffract?sound- wavelength of metres so diffract through doorways/corners
light- very small wavelength so diffracts through a tiny gap - 10the angle of incidence and reflection are always...the same
- 11—
- 12—
- 13what makes the light bend?speed increases = angles gets bigger
speed decreases = angle gets smaller - 14what is the similarity between the rays going into and out of the glass?they are parallel
- 15what happens if a light ray hits glass at a 90 degree angle?there is no refraction but the light ray does still slow down
- 16what is the critical angle?42 degees
- 17explain total internal reflection and give an exampleWhen an incident ray has an angles of or less than 40 degrees it will refract. However if the angle is more than this then the ray will refract internally.
optical fibres - 18why do light rays refract?because the material they are entering is denser than air what they are coming out of and so the angle of refraction gets smaller as the ray slows down in speed.
- 19how do 'cats eyes' in the road work?2 mirrors at 90 degrees to each other reflect light back in the direction that it come from regardless of its angle of incidence
- 20describe the characteristics of a sound wavelongitudinal wave- particles move forwards and backwards parallel to the energy
draw as a transverse wave on an oscilloscope. peak = compression. trough = rarefaction - 21describe these waves1. quiet, low pitch
2. loud, low pitch
3. loud, high pitch
- 22what is the electromagnetic spectrum lowest to highest frequency?radio
micro
infra red
visible light
UV
Xray
gamma - 23a wave that has a LOW frequency, has a ...... wave length and ..............energy. a wave that has a HIGH frequency, has a ...... wave length and ..............energy.a wave that has a LOW frequency, has a long wave length and low energy.
a wave that has a HIGH frequency, has a small wave length and high energy. - 24what is visible light, micro, infrared and radio waves used for?visible- photography, optical fibres
micro- mobile, bluetooth, satellite TV
infrared- remote controls
radio- broadcast TV and radio - 25what is the difference between TV and radio signals?TV- shorter radio wave lengths ~ can't diffract round hills very well
Radio~ larger wave lengths ~ can diffract around hills - 26why are micro waves used for travelling between satellites?shorter than radio waves ~ little difraction
dont get absorbed by atmosphere - 27How do aerials work?the electrons in the aerial are vibrated using an a.c current. The electrons emit an em. wave with the same frequency as the a.c current.
When a radio wave hits the aerial it makes the electrons vibrate at the waves frequency = produces same a.c current - 28what are the dangers of infrared, visible, UV, x-ray and gamma rays?infrared- skin burns
visible- damage to retina from sun or lasers
UV- skin cancer ~ mutates/kills cells
xrays and gamma rays- mutates/kills cells - 29what properties do all electromagnetic waves have in common?defract
reflect
refract
travel at same speed
can't travel through vacum
transfer energy
straight lines - 30why cant astronauts hear anything in space?no particles to vibrate and sound cant travel through a vacum
- 31What is the doppler effect?wave source moves towards = small wave length, higher frequency (higher pitch)
waves source moves away = large wave length, lower frequency (lower pitch) - 32What is cosmic micro wave background radiation?the expectation that if the Big Bang Theory is correct, then space would be full of random microwave activity; this can be detected.
- 33How does red shift support the Big Bang Theory?if the universe is expanding, everything is moving away ~ longer wave lengths than expected (black lines nearer to red than we expect).
Bigger the RS = faster the galaxy is moving away
Blue shift = moving towards
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- GCSE Physics FlashCards sobre GCSE Core Waves, criado por bronwyn831 em 01-04-2016.
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- bronwyn831
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