Technical data

Photometric law of distance - inverse square law

Article no: P2240267

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> Unknown

Principle

The luminous intensity emitted by a punctual source is determined as a function of distance.

Benefits

Find out how exactly it becomes darker with increasing distance from a light source
Get results fast and reproducible with a data-logging system
Analize results easily and compare them to theory using a computer

Tasks

The luminous intensity emitted by a punctual source is determined as a function of distance from the source.
The photometric law of distance is verified by plotting illuminance as a function of the reciprocal value of the square of the distance.

Learning objectives

Cobra SMARTsense Light - Sensor for measuring the illuminance 0 ... 128 kLx (Bluetooth + USB)	12906-01	1
measureLAB, multi-user license	14580-61	1
Lamp holder E 14,on stem	06175-00	1
Filament lamp 6V/5A, E14	06158-00	1
PHYWE Power supply, 230 V,DC: 0...12 V, 2 A / AC: 6 V, 12 V, 5 A	13506-93	1
Stand tube	02060-00	1
Barrel base for 1 rod	02004-00	2
Meter scale, l = 1000 mm	03001-00	1
Bench clamp expert	02011-00	1
Screen, metal, 300 x 300 mm	08062-00	1
Holder for Cobra SMARTsense	12960-00	2
USB charger for Cobra SMARTsense and Cobra4	07938-99	2
Stand rods, stainless steel, various sizes	02031-00	2
Right angle clamp expert with fulcrum screw	02054-00	2
Stand rods, stainless steel, various sizes	02030-00	1