3B SCIENTIFIC PHYSICS U11364 Folha de instruções - Página 2

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6. Experimental applications

Investigation of the inverse square law for a

point light source

Properties of polarising filters

Demonstration of the flickering effect of alter-

nating current for fluorescent lamps

Measurement of solar energy

Studies of reflection

Measurements of illuminance at work-stations

and personal areas

Relationship between light intensity and growth

of plants

7. Sample experiment

Investigation of the inverse square law for a

point light source

Apparatus needed:

1 3B NETlog

@ 230 V

1 3B NETlog

@ 115 V

1 3B NETlab

1 Light sensor

1 Experimental lamp, halogen

1 Transformer @ 230 V

1 Transformer @ 115 V

1 Barrel foot

1 Vertical ruler, 1 m

2 Universal clamps



Set up the experiment as shown in Fig. 1.



On the 3B NETlab

program (template) for the experiment with

the light sensor.



Lay the ruler horizontally, and fix the exper-

imental lamp at the 15 cm mark using one

of the universal clamps.



Define this point as distance zero, 0.



Mount the light sensor on the ruler using

the other universal clamp.



Connect the electric cables to the experi-

mental set-up and switch on.



Start the template program, select "manual

input", and measure the light intensity at

the first point, a distance of 5 cm in front of

the experimental lamp.



Increase the distance in steps of 5 cm up

to the 70 cm mark (a distance of 55 cm

from the experimental lamp), and record

3B Scientific GmbH  Rudorffweg 8  21031 Hamburg  Germany 

1000540

1000539

1000544

1000562

1003038

1000593

1006780

1001045

1000743

1002830

, open the application

Subject to technical amendments

the corresponding light intensities in the

3B NETlab

(Fig. 2).



Generate the data curve using the "Fit"

function.

Fig. 1 Investigation of the inverse square law for a

point light source

Fig. 2 Plot of the data points from the inverse

square law experiment on the monitor screen

of the 3B NETlab