Flashcards
Wave behaviour
Flashcards do conjunto (19)
- 1What is a wave?It is a transfer of energy from one place to another through oscillations without matter being transferred as well. Some waves can travel through substances/ mediums. All waves can reflect. Some waves can travel through empty space
- 2What are some types of waves?Transverse waves - e.g light waves. Oscillations are 90' to the energy transfer
Longitudinal waves - e.g sound waves
Oscillations are parallel to the direction of energy transfer - 3What are two key terms to do with longitudinal waves?Compression: Particles are forced close together when the pressure is high
Rarefaction: Particles move apart when the pressure is lower
Longitudinal waves are vibrations in the air particles, and can't travel in a vacuum - 4Important properties: Wavelength Frequency Amplitude PeriodWavelength: Distance between any 2 corresponding points on a wave. e.g crest
Frequency: Number of waves passing a point every second
Amplitude: Maximum displacement from the equilibrium potion. A measure of the energy in a wave
Period: Time for one complete wave to pass a point - 5Label the wave
- 6Label the longitudinal wave
- 7Label
- 8Virtual V.S real imageIn a virtual image, light rays don't actually meet on the object and therefore the image cannot be projected on a screen. Vice versa for a real image
- 9Lateral inversion and periscopesLateral inversion is when an image is reflected and the virtual image is flipped
In periscopes, mirrors are placed at a 45' angle - 10RefractionWhen waves travel from one medium to another. There is a bending of light. As the wave enters the medium, the velocity/speech of the wave changes.
- 11Law of reflection and law of refractionLaw of reflection:
The angle of incidence always equals the angle of reflection
Law of refraction:
When light travels from an optically more dense medium to and optically less dense medium, it bends away from the normal, and vice versa
Less to more towards
More to less away - 12Understand the concept of apparent depth and draw a labelled diagram
- 13Total internal reflection and the critical angleWhen the angle of incidence increases, so does the angle of refraction. At one point the angle of refraction is 90' and the incident angle in the more dense medium is called the critical angle.
If the and of incidence becomes bigger then the critical angle, the light ray is reflected back into the same more dense medium. This is called total internal reflection - 14DispersionWhen white light enters a prism it splits into 7 colours (knows a ROY G BIV, red, oragne, yellow, green, blue, purple), this is know as dispersion.
When white ligth refracts from air to glass, the different colours begin to travel at different speeds and refract by different amounts. For example, red has the longest wavelength and the smallest frequency, so it bends the least. And vice versa with violet - 15MirageWhen light passes through hot air (less dense) it is subject to TIR and starts moving upwards
- 16FormulasF = 1/T
T = 1/F
D = VT
V=wavelengthF - 17Diffraction - understand concept in terms of wavelength etc. Draw diagramsLow frequencies have a longer wavelength. A longer wavelength makes the diffraction more pronounced
- 18Amplitude - using physics, explain why the amplitude of a wave decreases over timeThe wave looses energy due to friction as the wave spreads over a wide area. The energy of the wave cannot be maintained and therefore the energy is lost to different forms of energy and the intensity of the wave is lost
- 19Draw a labelled diagram of dispersion through a prism
Informações
- Descrição
- Year 10 Science FlashCards sobre Wave behaviour, criado por Sophie Paulsen em 13-09-2016.
- Criado por
- Sophie Paulsen
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