Flashcards
Waves
Flashcards do conjunto (40)
- 1What do waves carry?Energy and/ or information
- 2What do waves travel through?A medium
- 32 examples of transverse wavesWater waves, electromagnetic waves
- 4What does a transverse wave look like?
- 5What is the direction of vibration in a transverse wave?Up and down (vertical)
- 6What is the direction of movement in a transverse wave?Perpendicular to direction of vibration (horizontal)
- 7What does a longitudinal wave look like?
- 8What is the wavelength in a longitudinal wave?From eg start of one compression to the start of the next
- 9What is the wave frequency?Number of waves passing a point every second
- 10What is the wavefront?The line of peaks viewed from above
- 11What is a ray?The direction the wave is moving- always perpendicular to the wavefront
- 12How to work out velocity of a wave?Frequency x wavelength
- 13How to work out the period?1/frequency
- 14What is the amplitude?The maximum distance a point moves from its rest position when a wave moves
- 15How does frequency change when a wave crosses a boundary?Frequency doesn't change
- 16How does the wavelength change if wave slows down?Wavelength gets shorter
- 17How does wavelength change if wave speeds up?Wavelength gets longer
- 18If going from slow to fast medium, how does the wave bend compared to the normal?Away from the normal
- 19If going from fast to slow medium, how does the wave bend compared to the normal?Towards normal
- 20Is shallow water faster or slower than deep water?Shallow water is slower than deep water
- 21Is a solid slower or faster than air?A solid is slower than air
- 22What does the angle of incidence equal?It equals the angle of reflection
- 23What is diffraction?The bending of waves through a gap or round an obstacle
- 24Big or small diffraction through a wide gap?Small diffraction through a wide gap
- 25Big or small diffraction with a long wavelength?Big diffraction with a long wavelength
- 26What is reflection of sound?An echo
- 27What happens to sound at a boundary?Some is transmitted, some is absorbed and some is reflected
- 28For a sound wave, what does a bigger amplitude mean?A bigger amplitude means that the sound is louder
- 29In a sound wave, what does a higher frequency mean?A higher frequency means a higher pitch
- 30What is the speed of sound in air?320 m/s
- 31What is the speed of light in air?300 000 000 m/s
- 32What are the audible frequencies of sound?20Hz- 20kHz
- 33Order of electromagnetic waves from short to long wavelengthy rays, x rays, ultra violet, visible, infra red, microwaves, television, radio
- 34What is monochromatic radiation?When there is only 1 frequency present in the radiation
- 35Example of monochromatic radiationLaser
- 362 uses of y- raysSterilising food, medical uses
- 372 uses of x- raysMedical x rays, security scanning
- 382 uses of ultra violet raysSun tan, theatre
- 392 uses of infra red raysNight sight, physiotherapy
- 40Why may microwaves and x rays da,age the brain?Because of high energy photons
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- Physics FlashCards sobre Waves, criado por lidiaberthon em 06-04-2015.
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- lidiaberthon
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