Flashcards
Waves
Flashcards do conjunto (29)
- 1What is a wave?Energy spreading out from an oscillating source, without the transfer of matter.
- 2What is an oscillation / pulse / cycle?A single wave, a single vibration:
a repeating movement - 3What is the frequency? Measured in ...The number of oscillations per second.
Hertz. - 4What is a period?The number of seconds per cycle
or
The time taken for one oscillation - 5What is the velocity?How far a wave moves in one second
or
How quickly is the wave moving to the right - 6What are the crests and troughs?Crests = the highest point on a single wave
Troughs = the lowest points on a single wave - 7What is an amplitude?The distance from the position of equilibrium to the crest / trough.
- 8What is the wavelength?The distance between any 2 identical points on a wave, for example between 2 crests or troughs
- 9What is the wave spectrum?The range of different wavelengths and frequencies.
- 101) Higher frequency = 2) Lower frequency =1) Higher pitch
2) Lower pitch - 111) Higher amplitude = 2) Lower amplitude =1) Louder volume
2) Lower volume - 12State the wave equation.Wave speed = frequency × wavelength
v = f × λ - 13What is the human audio spectrum?20 Hz - 20 kHz
- 14Frequency =cycles / second
or
1/T
(T is the period) - 15Period =second / cycle
or
1/f
(f is the frequency)
or
λ / f - 16What are longitudinal waves?Waves in which the vibrations are parallel to the direction of wave travel.
- 17What are transverse waves?Waves in which the vibrations are perpendicular to the direction of wave travel.
- 18What are 3 effects on waves?1) refraction
2) reflection
3) diffraction - 19What is wave reflection?When the wave reflects (bounces back) from an obstacle.
- 20What is wave refraction?When the wave slows down in a different medium and changes direction.
- 21What is wave diffraction?When the waves spread out / bend as they pass through a gap / an obstacle.
- 22Which gap / obstacle sizes produce the best diffraction?Gap / obstacle sizes that have the same size as the wavelength passing it.
- 23What happens when the wavelength is smaller than the gap / obstacle?The waves won't get diffracted a lot.
- 24Shorter wavelengths get diffracted ... than bigger wavelengths.Less
- 25Bigger wavelengths get diffracted ... than smaller wavelengths.More
- 26Why can we hear around a corner, but can't see around a corner?Because light waves are very small and we would have to have a microscopic opening in order to see behind the corner.
- 27What is an echo?Refleted sound.
- 28What is an ultrasound?Sounds that are above the range of human hearing.
- 29What are some uses of ultrasounds?1) Breaking up kidney and gall stones
2) Scanning the womb (pulses reflected from the baby form an image)
3) Echo-sounding (e.g. on ships, to measure the depth of the water)
Informações
- Descrição
- Physics FlashCards sobre Waves, criado por Nadia Jonckheere em 15-12-2018.
- Criado por
- Nadia Jonckheere
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