3. Results

Data Analysis
With the results obtained, we will use them to calculate Planck’s Constant and see how accurate our results are.
E=hc/λ


Results


The results of our experiment are as shown below:
Table 1:Table of warm/yellow LED milliamperes and voltage
(*First row of results are activation volts/current)


Warm/yellow
Voltage/Volts
Current/milliamperes  result 1
Current/milliamperes result 2
Mean current/milliampere
2.47
0.02
0.02
0.020
2.55
0.14
0.11
0.125
2.60
0.44
0.28
0.360
2.65
1.12
0.57
0.845
2.70
2.24
1.05
1.645
2.75
3.38
1.65
2.515


Table 2:Table of blue LED milliamperes and voltage
(*First row of results are activation volts/current)
Blue
Voltage/Volts
Current/milliamperes result 1
Current/milliamperes result 2
Mean current/milliampere
2.40
0.03
0.03
0.030
2.45
0.09
0.07
0.080
2.50
0.27
0.22
0.245
2.55
0.67
0.66
0.665
2.60
1.47
1.39
1.430
2.65
2.63
2.58
2.605


Table 3:Table of green LED milliamperes and voltage
(*First row of results are activation volts/current)
Green
Voltage/Volts
Current/milliamperes  result 1
Current/milliamperes result 2
Mean current/milliampere
2.17
0.05
0.05
0.050
2.20
0.09
0.08
0.085
2.25
0.23
0.20
0.215
2.30
0.45
0.42
0.435
2.35
0.77
0.73
0.750
2.40
1.16
1.08
1.120


Table 4:Table of red LED milliamperes and voltage
(*First row of results are activation volts/current)
Red
Voltage/Volts
Current/milliamperes result 1
Current/milliamperes result 2
Mean current/milliampere
1.70
0.09
0.09
0.090
1.75
0.43
0.35
0.390
1.80
1.35
1.20
1.275
1.85
3.23
2.73
2.980
1.90
6.32
6.02
6.170
1.95
10.80
10.23
10.515


Table 5:Table of orange/amber LED milliamperes and voltage
(*First row of results are activation volts/current)
Orange/amber
Voltage/Volts
Current/milliamperes result 1
Current/milliamperes result 2
Mean current/milliampere
1.735
0.08
0.09
0.085
1.800
0.40
0.34
0.370
1.850
1.35
1.08
1.215
1.900
3.80
3.65
3.725
1.950
8.90
7.54
8.220
2.000
16.90
16.73
16.815



Table 6:Table of 1/λ (typical wavelength)


LED Colour
Typical wavelength, λ/nm
Activation voltage/volts
1/λ(m^-1)
Red
623
1.700
1.60514 x 10^6
Orange
586
1.735
1.70648 x 10^6
Green
567
2.170
1.76367 x 10^6
Blue
467
2.400
2.14133 x 10^6
Yellow
590
2.470
1.69492 x 10^6
Graph 1:Graph of activation voltage (y-axis) against 1/λ (x-axis)


Graph 2:Graph of voltage (x-axis) against milliampere (y-axis) for tables 1-5


This is the equation to calculate Planck’s Constant, where c=the speed of light, e=the charge on an electron and m=gradient of linear regression.

h=em/c

Our result was:

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