Observations:
Specification of Filters:
Colour
Blue
Green
Yellow
Orange
Red
Wavelength (nm)
460
500
540
570
635
Last updated in Dec 2017 ©NISER
Page 5
Table 1: For I-V characteristics
Voltage (+ ve polarity)
Current (μA)
Voltage (- ve polarity)
Current (μA)
Table 2: Data for stopping potential ~ wavelength
Stopping potential (V)
Wavelength (nm)
Graph:
1. Plot I~ V characteristics for different wavelengths.
2. Plot Stopping potential ~ (1/wavelength) and calculate slope and intercept using Eq.
4. A sample graph is shown in Fig.4.
1.5
1.6
1.7
1.8
1.9
2.0
2.1
2.2
-1.1
-1.0
-0.9
-0.8
-0.7
-0.6
-0.5
-0.4
-0.3
Observed data
Linear fit
h = 6.06 x 10
-34
Js
S
to
p
p
in
g
p
o
te
n
ti
a
l
(V
)
1/λ
λ
λ
λ (
x10
-3
nm
-1
)
Equation
y = a + b*x
Weight
No Weighting
Residual Sum of
Squares
0.00163
Pearson's r
-0.997
Adj. R-Square
0.99202
Value
Standard Error
B
Intercept
1.44997
0.09583
B
Slope
-1.13628
0.05091
Fig. 4: Sample graph
Calculation and estimation of error: Determine h and
φ
and estimate error.
Last updated in Dec 2017 ©NISER
Page 6
Precautions:
1. Rotate all the knobs very slowly.
2. Handle the filters with utmost care and avoid touching their surfaces.
Reference:
1.
http://physics.nist.gov/cuu/index.html
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