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### 39 Cards in this Set

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