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5373231
P1 - 1
Descripción
First half of P1 for GCSE OCR Physics
Sin etiquetas
ocr
gcse physics
p1
heat
light
cooking
laser
physics
p1
gcse
Mapa Mental por
Charlotte H
, actualizado hace más de 1 año
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Creado por
Charlotte H
hace más de 8 años
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Resumen del Recurso
P1 - 1
Heat Transfer
Conduction
Particles oscillate
Best in solids
Particles close together
Worst in gases
Particles spread out
Convection
Convection Currents
Hot air rises
Cold air falls
Can't form in small spaces
Stopped by solids
Most effective in gases
Radiation
Transferred by electromagnetic waves
Stopped by reflective surfaces
Insulation/Insulators
Cavity Wall Insulation
Reflective surfaces prevent Radiation
Air pockets too small for convection currents to form
Mainly gas, conduction is weak in gases
Insulators don't conduct heat or electricity
They stop the heat/electricity from passing through them
Loft Insulation
Stops heat being lost from the loft
Waves
Transverse
Wave goes up and down while going along
Longitudinal
Wave goes in and out
Light
Reflection
Light hitting a shiny surface and being reflected
Angle of Incidence = Angle of Reflection
Refraction
Ray of light changes direction
Wave changes speed
Less dense material -> More dense material
Total Internal Reflection (TIR)
When the angle of Incidence is bigger than the critical angle
Light is reflected instead of passing through
Optical Fibres
Uses TIR
Long, flexible transparent glass with a small diameter
Used for communication
Quick speed
Lasers
Intense beam of light
Light waves all:
In Phase- Peaks and troughs of each wave line up
Same frequency
Do not Diverge
Coherent + Monochromatic
Diffraction
Wave spreads out when it passes through a space the same size as the wavelength
Can also happen if the wave passes an obstacle
Electromagnetic Spectrum
Gamma, X-Ray, UV, Visible, Infra red, Microwaves, Radio Waves
High frequency -> Low frequency
Short wavelength -> Long wavelength
Transverse wave
Cooking
Infra red cooking
Toaster, hob or an oven
Hotter objects emit more infra red than cooler ones
Food particles absorb the infra red
Black absorbs infra red better than a paler one
Shiny objects reflect infra red so they don't get hot easily
Microwaves
Penetrate about 1cm into the food
Absorbed by water and fat molecules
Cook food quicker than infra red
Shiny metal reflects them
Food should be stirred so that the heat can be spread around
Particles
Gain kinetic energy
Surface of the object
Conduction used to transfer the heat through the food so that it it cooked through
Communication
Light is fast but normally requires optical fibres
Radio can travel far but signal can be lost
Electricity is reliable and signals can be boosted but requires wires
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