Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Define Essential Parts of Photocolorimeter - Monochromators?
This is a means of selecting a sufficiently narrow waveband. Early colorimeters used glass filters that transmitted a wide segment of the spectrum (50 nm or more). Newer instruments use interference filters that consist of thin layer of magnesium fluoride crystals with a semitransparent coating of silver on each side. Interference filters have a band pass of 5-8 nm. The term band pass is defined as the width of the spectrum that will be isolated by a monochromator, i.e. it is the range of wavelength between the points at which the transmittance is equal to one half of the peak transmittance.
The inexpensive spectrophotometers commonly used in the laboratory have a band pass of 20 nm but more sophisticated instruments may have a band pass of 0.5 nm. The monochromator consists of an entrance slit to exclude unwanted or stray light followed by absorption or interference filters, prisms or diffraction grating for wavelength selection. This is preceded by a series of light focussing lenses. Instruments using filters as wavelength selector requires lenses to focus correctly the light from the source through the filter and cuvette to the detector. But in the ultraviolet range, quartz or fused silica is essential because glass does not transmit light efficiently at wavelength shorter than 340 nm. An exit slit at the end of monochromator allows only a narrow fraction of the spectrum to reach the sample cuvette. Some spectrophotometers have a nonmovable slit whereas in some the slit width varies automatically as the wavelength changes.
First Stage of Invagination The large endodermal cells that are remaining in the vegetal plate move laterally towards the centre of the plate and fill the gap in the vegetal
Q. Describe about Cardiomyopathy due to Persistent Tachycardia? In occasional cases, particularly in children recurrent or incessant episodes of supraventricular or ventricular
What grade did you get in biology?
How do I use a pedigree charts
Galactosemia Inability of conversion of galactose to glucose results in the accumulation of galactose in the blood - known as galactosemia. The biochemical defect usuall
Ribosomes - It is also known as Protein factory, Engine of the cell. Ribosomes are smallest cell organelles (150 x 250 Å). Unit membrane less cell organelle. Ribo
Q. What are the major events of the first mitotic period? The first mitotic period is the prophase. During prophase the following events occur migration of each centriole pair
Question 1 Write a short note on the following Impactors Land fills Bio stimulation Green house effects Question 2 What is bioremediation? Give an account o
Energy Contrary to matter. Energy neither occupies space, nor possesses mass. Hence it is defined, not on physical ,but on operational or functional basis as the force whic
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!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd