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39 Cards in this Set
- Front
- Back
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What are longitudinal waves? |
Longitudinal waves are parallel to the propagation of the wave. E. G. Sound waves in the air |
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What are transverse waves? |
Transverse waves are perpendicular to the direction of the propagation of waves. E. G. Light rays in space |
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What is a wave? |
A wave is something that transmits energy over a distance. Most waves include the vibration of particles. |
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What is the frequency of a wave? |
It's the number of cycles/wavelengths that pass a specific point every second |
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What is frequency of waves measured in? |
It is measured in Hertz(Ha) or per second /z. |
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What is the time period of the wave? |
It is the time a wavelength takes to pass a specific point. |
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Where is amplitude measured from? |
It is measured from the White/dotted line to the peak. |
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What are wavelengths? |
They are the distance between two peaks or two troughs. (Unit :Metres) |
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What happens when two waves meet? |
They add together or subtract from each other. |
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What is a medium? |
A medium is any material that light can travel through. |
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What is refraction? |
When light rays travel from one medium to another they bend. |
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The longer the tuning fork... The |
Lower the noise will be |
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The shorter the tuning fork... |
The higher the noise will be |
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The more tension there is in the wire... The |
Higher the note will be. |
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Why can sound travel through materials? |
Sound travels through materials because the particles in the materials vibrate. |
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In which state of matter does sound travel the quickest in? |
In a solid because the particles are close to each other making it easier for the vibrations to pass on. |
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Why can't sound travel through space |
There is no air in space so sound can't pass their vibration onto particles. |
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which part of the ear collects sound waves? |
The ear lobe |
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Where does sound travel to once it reaches the ear lobe and what does it cause? |
It travels along the ear canal causing the ear drum to vibrate. |
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What happens after the ear drum vibrates? |
The small bones (earbones) amplify the vibrations. |
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What does the cochlea do in the ear? |
It transforms the vibrations into electrical signals. |
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What does the auditory nerve do? |
They take the electrical signals towards the brain. |
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What is the unit for loudness? |
Decibels |
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What are ultrasounds? |
They are objects that vibrate so quickly (high frequency) that you may be unable to hear the sound they produce. |
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What are infrasounds? |
They are objects which vibrate so slowly (very low frequency) you may be unable to hear the sound they produce. |
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What are luminous objects? |
They are objects which create their own light. E. g. Sun |
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What are non- luminous objects? |
They are objects which don't create their own light. E. G. moon |
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Why can we see things? |
Because light reflects from the object into our eyes. |
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Angle of incidence equals to |
Angle of reflection. |
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What happens when light moves from a less dense to a dense medium? |
They ray bends towards the normal. Therefore i will be more or equal to r. |
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What happens when light moves from a more dense to a less dense medium? |
The rays will bend away from the normal. |
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What do lens do? |
They focus light, allowing us to magnify and diminish images or bring them into focus. |
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What type of lenses are there? |
Convex or concave lenses. |
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Which colour refracts the most and why? |
Violet because it slows down the most so has more time to refract. |
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Which colour refracts the least and why? |
Red because it slowed down the most so had less time to refract. |
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What happens when light hits a white ball? |
Light reflects all colours so the ball would look white. |
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What would happen if there was light shining towards a red filter towards a blue ball? |
It would only allow red light to pass and then make the blue ball look black. |
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What happens when light hits a rough surface? |
A process called diffuse scattering happens where light reflects at all direction. |
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What is dispersion? |
The spreading out of colours |
