Define barrier layer cells (photocells), Biology

Assignment Help:

Define Barrier layer cells (photocells)

They are the very simple of the detectors. It contains the bottom support layer of conductive metal like iron. A photosensitive layer of the selenium /cadmium (the positive electrode) rest on the top of the metal support. This light sensitive materials is covered along with a transparent thin layer of gold (the negative electrode). Light passing by the transparent layer to the selenium, causes the release of electrons from selenium. These emitted electrons move to the clear conductive layer and make a weak electric current as they complete a circuit by flowing to the metal support. So the current produced is a direction function of the light intensity striking the photocell.


Related Discussions:- Define barrier layer cells (photocells)

State the term - localisation scales, State the term - localisation scales ...

State the term - localisation scales The localisation scales are also empirically derived, being based on studies of patients with localised brain lesions. There are frontal,

Assessment of tricuspid and pulmonary orifice areas, Assessment of Tricusp...

Assessment of Tricuspid and Pulmonary Orifice Areas Due to the rarity of tricuspid stenosis and pulmonary stenosis, no general agreement exists on what constitutes critical o

Perception of light - floral induction, Perception of Light - Floral Induct...

Perception of Light - Floral Induction Stimulus Leaves are found to be organs that perceive light 'stimulus', K.C. Hamner and J. Bonner showed in 1938 that even if all the lea

Post removal technique using prs kit, Post removal Technique using PRS kit ...

Post removal Technique using PRS kit -Transmetal efficiently doming the post head . -Select suitable sized trephine . -Place drop of RC prep on the post head as lubrican

Comparison to healthy lungs, The nature of the sounds produced by percussio...

The nature of the sounds produced by percussion (tapping) a patient's chest can tell a physician a great deal about the condition of the organs within the thoracic cavity. Healthy,

What do you mean by blinking and peering in the eyelid, What do you mean by...

What do you mean by blinking and peering in the eyelid? Blinking and Peering: Blinking considers as to the opening and closing movements of the eyelid. The function of b

Explain with reference to aquatic ecosystem, That is eutrophication? Explai...

That is eutrophication? Explain with reference to aquatic ecosystem. or Name any two source organisms of agar. List any four areas in which agar has wide application.

Name the two groups of nephrons, Name the two groups of nephrons on the bas...

Name the two groups of nephrons on the basis of their position in the kidney. How are they different from each other? a) How is the halophyte Rhizophora adapted to survive in i

Onset of puberty in male, ONSE T OF PUBERTY IN MALE Puberty is the ...

ONSE T OF PUBERTY IN MALE Puberty is the period when reproductive organs become functional. It is attained at the age of 13-16 yrs. It is stimulated by testasteron. I

Loudness, The sound levels of power, intensity and pressure are the physica...

The sound levels of power, intensity and pressure are the physical effects which the human ear receives, it is not, however, what the person perceives. What is being perceived or h

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd