Flashcards
Waves Done
Flashcards do conjunto (24)
- 1Longitudinal WavesA wave that vibrates in the direction of energy release.E.g Sound Waves
- 2Transverse WavesA wave that the Vibration is at a right angle to the direction.
- 3What is FrequencyHow many waves are in a certain time period (usually 1 second)
- 4What is Amphlitudehow big the wave is (determines the volume of the sound)
- 5What is a Wavelengthis the length of a full wave from one point of the wave to the same point of the following wave.
- 6Wave Speed =Frequency x Wavelength
f x λ - 7How Frequency relates with time period
- 8The Colours in Visible LightRed
Orange
Green
Yellow
Blue
Indigo
Violet - 9Electromagnetic Colour RuleAll electromagnetic waves travel at the same speed in free space. The higher the frequency, the higher energy
- 10Electromagnetic SpectrumRadio waves
Microwaves
Infra-Red Radiation
Visible Light
Ultra Violet
X Rays
Gamma Rays - 11Radio Waves UsesBroadcasting and communications
- 12Microwaves Uses and DangersCooking and satellite transmissions
Internal heating of body tissue - 13Infra-Red Radiation Uses and DangersHeaters and night vision equipment
Skin burns - 14Ultra Violet Uses and DangersFluorescent lamps
Damage to surface cells and blindness - 15X- Rays usesObserving the internal structure of objects and materials and medical applications
- 16Gamma Rays Uses and DangersSterilising food and medical equipment
Cancer, mutation - 17WavefrontsA wavefront is an imaginary surface representing corresponding points of a wave that vibrate in unison.
When viewed from above it can be seen as like a peak of the wave - 18The Doppler EffectAs the ambulance travels towards you the emitting of the sound stays constant. However since it’s moving towards you and its travelling slightly closer to the speed of sound it emits the sound closer to the previous sound wave. This means when that there is a higher frequency which therefore means a higher pitch. When the ambulance passes you the frequency decreases along with the pitch because the ambulance is travelling away from you so the wavelengths increase. This is because the sound source is moving away from you meaning the ambulance emits the sound wave further from the last.
- 19Reflection- Know that Light Waves are Transverse and Sound Waves are Longitudinal but both can be reflected and refracted. Light moves in STRAIGHT LINES that’s why we can’t see around the corner.
- Sound waves produce echoes which are reflections of waves. This also tells us that sound travels slower than light as echoes take a significant time to reach us.
- The angle of incidence is equal to the angle of reflection,
- I = r - 20RefractionRefraction is when a wave hits a denser object causing it to decrease in speed and change direction. However it depends on the angle of incidence. When it hits the block the density increases making the speed decrease along with the wavelength. The light always bends towards the normal. The number of how optically dense an object is the refractive index. It is a number that tells us how much light slows down (compared to light travelling through a vacuum).If the refractive index was 2, it would mean that light travels 2 times faster in a vacuum.
Refractive index = sin i / sin r - 21The Critical Angle- The critical angle is the last angle that refraction happens at which light is refracted at 90 degrees along the surface edge.
c= sin^-1 (1/n)
- Diamond has a very large refractive index, meaning light will reflect more often- this is what causes it to sparkle. - 22Total Internal Reflection- It can only happen when it goes from a higher reflective index to a lower reflective index.
- Only happen if angle > than the critical angle. An example is fibre optic cables. - 23Hearing Sound- Longitudinal Sound Waves are travelling through the air as vibrations of air molecules and those vibrations are being detected by your ears.
Range of Human hearing is 20 - 20,000 Hz
Infrasound is below 20Hz
Ultrasound is above 20,000Hz
Speed of sound is 330m/s - 24Seeing SoundThe X axis on the oscillation machine shows the time period, one box = 1 time period. The Y axis shows the voltage reading which shows the sound. The sound gets displayed by sound being converted into voltage and displayed then on the screen. If we change the divisions the wave will look different on the screen however will be the same value.
Informações
- Descrição
- Yr 10 Physics (Waves) FlashCards sobre Waves Done, criado por Maxime PANS em 05-04-2018.
- Criado por
- Maxime PANS · abr 2018
- Atualizado
- 6 abr 2018
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- 6
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