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P1.4 - Waves
Fichas del conjunto (51)
- 1—v - rest position
w - trough
x - amplitude
y - wavelength
z - peak - 2what is frequency and what is it measured in?number of waves per second and hertz (Hz)
- 3how do you measure the distance of a wavelength (in metres)? (NOT GIVEN)distance = speed x time
- 4what are transverse waves and give examplesvibrations perpendicular to direction of wave
light, s waves, em waves - 5—y - direction of vibration
z - direction wave travelling
- 6what are longitudinal waves and give examples?vibrations parallel to direction of wave
sound, p waves - 7—v - direction of vibrations
w - wavelength
x - rarefaction
y - compression
z - direction of wave travelling
- 8how do calculate wave speed? (given)speed = frequency x wavelength
- 9what is the wave speed usually independent of?frequency and amplitude
- 10what is the law of reflection?angle of incidence = angle of reflection
- 11light travelling in a same direction that hits an uneven surface will...reflect at different angles
- 12light travelling at the same direction that hits an even surface will...reflect at the same angle
- 13what are the three things an image is in a mirror?*same size
*virtual
*laterally inverted - 14what do waves do to pass through a gap or go around a corner?spread out - diffract
- 15when the gap is wider than the wavelength what is the diffraction like?little or none
- 16when the gap is a little bigger than the wavelength what is the diffraction like?diffraction at edges
- 17when the gap equals the wavelength what is the diffraction like?maximum
- 18when the gap is smaller than the wave length what is the diffraction like?it cannot get through
- 19why can you not see someone round a door but you can hear them?light very small wavelength so doesn't diffract but sound wavelength is similar to door so diffracts well
- 20where does diffraction also happen?around objects
- 21what is refraction?when waves travel at different speeds in different mediums
- 22what happens when light enters a more dense medium?slows down so it refracts towards the normal
- 23what happens when light enters a less dense medium?it speeds up so refracts away from the normal
- 24what happens when light is travelling along the normal and hits a new medium?it changes speed but not direction so appears to not move as it is not refracted
- 25what are sound waves caused by?vibrating objects
- 26what type of wave is a sound wave?longitudinal
- 27what do the vibrations form in sound waves?compressions
- 28where do sound waves travel faster more or less dense materials and why?more dense as can pass particles on quicker
- 29can sound waves travel in space and why?no as no particles
- 30what is an echo?a reflected sound wave
- 31what can sound waves be absorbed by?things like furniture
- 32why do sound waves diffract?they travel quicker in denser mediums
- 33what kind of noise does a high frequency make?high pitched
- 34what type of noise does a low pitch make?low pitch noise
- 35what is a high frequency?short wavelength
- 36what type of noise does a high amplitude make?loud noise
- 37what type of noise does a low amplitude make?quiet noise
- 38what sound can humans not hear?above 20,000 hz - ultrasound
below 20 hz - infrasound - 39information such as texts are converted to what before transmitted?electrical signals
- 40electrical signals can be either?analogue or digital
- 41what happens to the electrical signals?*sent long distances down telephone lines
*or superimposed (mixed) onto carrier em waves - 42what is the amplitude and frequency like on an analogue signal?varies continuously as can take any value in a particular range
- 43what values do digital signals take?only two
- 44what does a digital signal wave look like?
- 45what happens to both types of signal as they are transmitted?weaken so may need to be amplified
pick up interference or noise from other signals - 46which signal is easier to clean and why?digital as they can only take two values it is much easier to see what it was meant to be whereas analogue could be multiple choices
- 47which signals are better quality?digital
- 48what is multiplexing?sending several digital signals at once using just one cable or em wave
- 49what are digital signals easier to process on and why?computers and digital devices and they are a major factor in our everyday lives
- 50what is the amount of information used to store a digital image or sound measured in?bytes
- 51when will images and sounds be of a higher quality?when amount of information stored is higher
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- GCSE Physics Fichas sobre P1.4 - Waves, creado por scottjowett el 11/06/2015.
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- scottjowett
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