Measurement of light intensity, Biology

Measurement of Light Intensity

How do we measure the intensity of a source of light falling on a surface? You know that light spreads out uniformly in all directions from a source. The amount of light shining on a unit area decreases with increasing distance, This decrease is equal to the square of the distance away from the source. Figure shown below shows how the intensity of light decreases with distance from the source.

26_measuer by light inten.jpg

Light intensity is measured in lux (metre candle). A lux is the amount of illumination shed on a square metre of cutved surface, one metre from a standard candle. Previously, the unlt foot candle (ftc) was used. A foot candle is the amount of illumination shed on a square foot of curved surface, one foot from a standard candle. To get an idealof the magnitude of footcandle, please read the accompanying margin remark.

Posted Date: 12/10/2012 5:58:52 AM | Location : United States







Related Discussions:- Measurement of light intensity, Assignment Help, Ask Question on Measurement of light intensity, Get Answer, Expert's Help, Measurement of light intensity Discussions

Write discussion on Measurement of light intensity
Your posts are moderated
Related Questions
Define r and K Strategists? Ecologists have identified two major types of reproductive strategies among species. Characteristic patterns can be seen among species relating the

Explain the organisation of the intensive care unit? The following kinds of professional groups are required in the day to day functioning of a modern intensive care unit: Th

Describe Examination of chest and abdominal ? As already mentioned earlier, any overt deformity of the chest, for example kyphosis, scoliosis, pectus exacavatum and pectus car

different applications of microbiology

Ventilation of Tracheal System - Diffusion Gaseous exchange due to diffusion generally takes care of the oxygen needs of most small insects. Similarly fairly large but inactiv

Explain about the forces acting on a gravity retaining wall. Forces Acting on a Gravity Retaining Wall: In a general way the forces that act on a gravity retaining wall. The

The oxidation of sugar in the cell of higher organisms takes place in the ?

1.  Explain why a gain of function would be a dominant effect and a loss of function would be a recessive effect. Which types of genes are each associated with: oncogenes or defect

Q. Function of Dopamine in consciousness? An increase in dopamine activity produces an increase in wakefulness. Dopaminergic neurons in the ventral tegmental areas are constant

Describe about Postural Changes in Dynamic Auscultation? a) On sudden assumption of supine position from standing on sitting position or sudden passive elevation of both legs: