Effect on resonant frequency of adding mass to the end of the string
Increased tension increases the resonant frequency
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What are coherent light sources in Young's Double slit exp
When the light is constantly in phase (a whole number of wavelengths difference in length at a certain point).
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What does the double slit experiment provide evidence of?
The wave nature of EM radiation, both because of the diffraction and interference of the waves
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Effect of using white light rather than a monochromatic laser?
Spectra of colour, the central maxima is white followed by high frequency colors down to red
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The formula of fringe separation
w= (wavelength x distance from slit to screen)/slit separation
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Calculation acceleration of g
Using a two part circuit with a switch, a ball baring is held a known height above the lower circuit switch, an electromagnet holds it. The switch is then pressed causing the magnet to turn off and the ball drop. A timer is started simultaneously.
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Using the data to equate g
Use various intervals of height and record the time to fall (probably both to obtain an average for these). Use suvat equation s=ut+1/2at^2 as the ball has no u, and g is equal to a, s=1/2 gt^2. Plot 2s on the y, t^2 on the x, making g the gradient
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Equation of resistivity
resistivity= RA/L
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What equiptment is needed to find resistivity in a wire
Cell, ammetre, a variable resistor to keep current the same, a wire (about a meter), ruler, a flying lead and jockey, an voltmeter across the wire component.
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Finding cross sectional area
Use a micrometer to find diameter (to +/- 0.01 mm) in three separate places along the wire and find an avarege. Halve and find r, the use pi x r^2
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Obtaining results
Start with the flying lead at a meter, using the variable resistor find a value of the current you wish to remain constant. Record the value of the voltmeter and of current for the given length. Repeat method while decreasing length in intervals.
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Finding RA/L
Use v=ir to find the resistance of the wire at each length, r=v/i, then plot a graph with r on the y axis and the length at which this resistance was found on the x axis, find the value of the gradient of the graph and x by cross sectional area.
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Equation involving emf internal resistance and terminal voltage
V(term)= -r I +emf
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Obtaining results
Vary a variable resistor to change the current in the circuit, the change in current causes a change in the voltmeter reading across the terminals of the battery. Vary the resistor in intervals and record v and i
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Finding internal resistance
Plot terminal voltage on the y axis and current on the x, relate V= -r I +emf to the standard linear eqn y=mx +c, therefore - r is the gradient of your graph, so by changing the sign of the gradient you find internal resistance
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Equation of Youngs Modulus and its SI units
E= (Force x original L)/(Area x Extension) SI=N/m^2
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Describe the equiptments setup
A long thin wire is clamped at one end, and is guided over a frictionless pulley at the other, the wire is taught but has no tension, a marker is placed a known distance from the clamp and original length recorded, a vernier scale is set to zero
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Obtaining results
Increase the force in intervals, remembering to times mass by g, and record the extension for each. Plot force over extension and times the gradient by original length/cross sectional area
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Other cards in this set
Card 2
Front
Effect on resonant frequency of adding mass to the end of the string
Back
Increased tension increases the resonant frequency
Card 3
Front
What are coherent light sources in Young's Double slit exp
Back
Card 4
Front
What does the double slit experiment provide evidence of?
Back
Card 5
Front
Effect of using white light rather than a monochromatic laser?
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