longer wavelengths are more significant in diffraction
3 of 25
Evidence for wave nature
diffraction of light passing through a narrow aperture
4 of 25
Voltmeters and Resistance
they have a resistance
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Voltage and Resistors
they share the voltage in proportion to their resistance
6 of 25
If resistance was to increase in a potential divider
then the voltage would increase
7 of 25
Increasing the Current
-increase in temperature -increase in KE vibrations -increase in resistance -decrease in rate of current
8 of 25
Current across resistors
it is the same across all resistors
9 of 25
Removing a resistor in parallel
increases the overall resistance of the section
10 of 25
How does stretching a wire affect the resistance?
-increase in length increases resistance -decreasing area increases resistance -R=pl/A
11 of 25
Area equation
volume/length
12 of 25
Proving l proportionality
R=p(l)^2/v
13 of 25
Why zigzag a wire in a gauge?
-longer wire fits in a smaller space -small change in length and still a large change in resistance
14 of 25
Velocity of a Wave Equation
v= F
15 of 25
Period Equation
T= 1/F
16 of 25
Frequency of a Wave Equation
F= number of waves/time
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Constructive Superposition
-if the path difference is n -two waves arriving in phase in the same place at the same time and so combine to reinforce each other -n2 radians out of phase
18 of 25
Destructive Superposition
-if path difference is n1/2 -two waves that are out f phase and arrive in the same place at different times -not n2 radians in phase
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Coherence
-of the same frequency or wavelength with a constant phase relationship -if the path difference is n
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Wavefront
the leading edge of a single pulse
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Pulse
an oscillation that lasts for one period
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Period
the time it takes for the system to complete one cycle/operation
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Cycle
the sequence of events that form one 'unit' of periodic motion
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Frequency the number of cycles executed per unit time
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