physics ocr waves
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physics ocr waves - Marcador
physics ocr waves - Detalles
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Preguntas:
40 preguntas
| 🇬🇧 | 🇬🇧 |
| Define wavelength | Distance between two identical successive points on a wave or the distance travelled before the wave repeats itself |
| Define wave | Transfer of energy from one place to another without any net transfer of matter |
| Define fundamental frequency | The lowest frequency , highest wavelength that can be produced |
| Define antinode | Maximum displacement |
| Define nodes | No displacement |
| Define coherent | When two waves have a constance phase relationship |
| Define diffraction | When a wave spreads out after passing around an obstacle or through a gap |
| Define refraction | When waves change direction when they travel from one medium to another due to different wave speed in each medium |
| Define reflection | When waves rebound from a barrier changing direction but remaining in the same medium |
| Define intensity | Power transmitted per unit area perpendicular to the direction of the wave propagation |
| Amplitude | Maximum displacement from a peak and rest position |
| Define displacement | Distance at any point of the wave from its rest position |
| Define frequency | The number of oscillations per unit time |
| Define period | Time taken for one complete pattern of oscillation to take place at any point |
| What happens when angle of incidence = critical angle | The wave will travel along the boundary of the material |
| What type of waves can be polarised? | Only transverse waves can be polarised as longitudinal waves do not have oscillations perpendicular to their direction of their travel. |
| What is a polarising filter? | A material which has crystalline material can cause the oscillating fields to happen in one plane only. |
| What controls the frequency of the vibrations of a string ? | The mass per unit length, tension and length of string |
| What happens when a stationary wave is formed? | Superposition occurs and a series of nodes and antinodes are produced |
| What conditions must occur for a stationary wave to be formed? | 2 waves travelling in the opposite direction overlap. waves having the same frequency m wavelength and amplitude |
| What is the relationship between intensity and amplitude ? | Intensity is proportional to amplitude squared, as amplitude decreases by a factor of 2 then intensity will decrease by a factor of 4 (2^2) |
| What is a diffraction grating ? | A piece of optical equipment made from glass with many thousands of very thing ,parallel and equally spaced grooves |
| What conditions must be met for superposition to occur ? | They must be coherent |
| What happens if complete deconstructive interference occurs ? | Waves completely cancel out resulting is 0 displacement . |
| What is deconstructive interference? | When the displacement of the original waves subtract to give the resultant wave a displacement that is less than both original waves |
| What is constructive interference ? | When the displacement of the original waves added together give the resultant waves a displacement that is greater than both the original waves |
| What is the principle of superposition? | States that when two or more waves of the same type meet, the resultant wave can be found by adding the displacement of the individual waves |
| What is the saying for refraction? | Less to more towards (LESS dense to MORE dense medium results in direction more TOWARDS the normal) |
| What does it mean if two waves are in anti-phase? | When the waves are half a wave cycle out of phase (180) |
| What does it mean if two waves are inphase? | 0 phase differences |
| What is a transverse waves | A wave that oscillates perpendicular to the direction of the wave |
| What is a longitudinal wave | A wave that oscillated parallel to the direction of the wave |
| What is a non-mechanical wave ? | A wave that does not need a medium to propagate in |
| What is a mechanical wave ? | Waves that need a medium to propagate in |
| What is the equation for speed? | Frequencyxwavelength |
| What is the equation for intensity ? | Power/area |
| What is the equation for refractive index? | Speed of light in vacuum (3x10^8) / speed pf light in material |
| What is snells law | N1xsin(angle of incidence)=n2xsin(angle of refraction) |
| What is young's double slit experiment equation | Wavelength=xa/d |
| What is the standing wave formulae? | Length = h x wavelength/2 |