Question

Which of the following statements can be related to colorimeters?
A) it is a light sensitive device
B) it is used to measure the absorbance
C) it is used to measure the transmittance
D) all of the above

Answer 1

A colorimeter is a colorimetry instrument that measures the absorption of certain wavelengths of light by a solution. The Beer–Lambert law, which states that the concentration of a solute is proportional to the absorbance, is commonly used to determine the concentration of a known solute in a given solution.

Complete Step By Step Answer:
The absorption of light waves may be measured using a colorimeter. The change in intensity of electromagnetic radiation in the visible wavelength portion of the spectrum following transmission or reflection by an object or solution is measured during colour measurement. Because the amount and colour of light absorbed or transmitted is dependent on the characteristics of the solution, including the number of particles in it, such a test can aid in determining the concentration of chemicals. A colorimeter compares the quantity of light that can pass through a solution to the amount that can pass through a pure solvent sample.
A colorimeter is a light-sensitive instrument that is used to determine the amount of light that passes through a liquid sample and its transmittance and absorption. It is used to determine the intensity or concentration of the colour that appears after a certain reagent is added to a solution. The Beer-Lambert rule says that the absorption of light passed through a medium is directly proportional to the medium concentration. This is how colorimeters operate.
Hence option D is correct.

Note:
A photocell is used in a colorimeter to detect the quantity of light flowing through the solution being tested. The photocell's current is determined by the amount of light that strikes it after passing through the coloured solution. The absorption of light increases with the concentration of the colourant in the solution; less light passing through the solution implies less current generated by the photocell.