How does a wavelength change over a travelled distance
the further it travels the longer the wavelength becomes
4 of 28
Light entering a block velocity
decreases
5 of 28
Light entering a block wavelength
decreases
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Light entering a block frequency
stays the same
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Refractive index
V1/V2 = sin01/sin02 = diagram
8 of 28
Ohms law definition
when the current is proportional to the p.d. providing the temperature of the conductor is constant
9 of 28
Unpolarised light
oscillates on many planes
10 of 28
Polarised light
oscillates on many planes
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Polarised glasses
-they have filters at 90 to the reflected light -they cut out the polarised light -they dont cut out the polarised light
12 of 28
Current equation
E/(R+r) = EMF/TotalR
13 of 28
P.d. equation
current x load resistor
14 of 28
Distance between slits increasing and the observed light
-bands become closer together -gap becomes too large for any overlap -no fringes are seen
15 of 28
Why does the p.d. across a load increase as current decreases?
-R +r in series -potential divider -r is constant -as R increases so does the p.d
16 of 28
When voltmeters with a large resistance are added to a circuit why doesn't the resistance change?
-connected in parallel -large value of resistance 1/voltmeters resistance -therefore a small addition to resistance
17 of 28
Infrasound
below human audible range
18 of 28
Longitudinal Waves
-air molecules vibrate -parallel direction of travel -series of compressions and rarefactions
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A resistor added to a circuit. effect on the total resistance
total resistance increases
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A resistor added to a circuit. effect on the p.d
p.d. stays the same
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A resistor added to a circuit. effect on the current
current decreases
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Materials with few electrons (n) and increasing temperature
the resistance will decrease as more electrons are shaken off atoms
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Materials with many electrons (n) and increasing temperature
the resistance will increase as electrons will collide with the atoms vibrations
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Coherent
constant phase relationship with the same frequency and wavelength
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Standing Wave
no transfer of energy
26 of 28
Path difference
by how much they are out of phase
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Why is there a turntable in a microwave
to allow the food to move so that is experiences both hot and cold spots. this means after a while all the food has experienced the same amount of energy
28 of 28
Other cards in this set
Card 2
Front
EMF Equation
Back
E/Q
Card 3
Front
1eV
Back
Card 4
Front
How does a wavelength change over a travelled distance
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