There is a substance in a solution (0.03 mole/liter). The length of cuvette is 2 cm and only 10% of the certain light beam is transmitted. What is the extinction coefficient of the substance

The molar absorptivity coefficient is, .

Explanation:

Using Beer-Lambert's law :

Formula used :

where,

A = absorbance of solution

C = concentration of solution =

l = path length = 2 cm

= incident light

= transmitted light

= molar absorptivity coefficient = ?

A compound absorb 90 % of the light and transmit 10% of light.

Transmittance = 10% = 0.1

Now put all the given values in the above formula, we get the molar absorptivity coefficient.

Therefore, the molar absorptivity coefficient is, .

explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

            and  

since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be and .  

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.