EI8551-AI-UNIT 1-1.7-Atomic absorption Spectrophotometer

Which of the following is the principle of Atomic Absorption Spectroscopy?

• a) Radiation is absorbed by non-excited atoms in vapour state and are excited to higher states

• b) Medium absorbs radiation and transmitted radiation is measured

• c) Colour is measured

• d) Colour is simply observed

In Atomic Absorption Spectroscopy, which of the following is the generally used radiation source?

• a) Tungsten lamp

• b) Xenon mercury arc lamp

• c) Hydrogen or deuterium discharge lamp

• d) Hollow cathode lamp

In Atomic Absorption Spectroscopy, with what material is the cathode in Hollow cathode lamp constructed?

• a) Tungsten

• b) Quartz

• c) Element to be investigated

• d) Aluminium

4. How can the intensity of radiation be increased in Hollow cathode lamp?

• a) Addition of non-conductive protective shield of mica

• b) Addition of nitrogen to neon or argon in the lamp

• c) Increasing the pressure of the filling gas

• d) Changing the metal of the anode

5. Which of the following is the function of the chopper in Atomic Absorption Spectroscopy?

• a) To split the beam into two

• b) To break the steady light into pulsating light

• c) To filter unwanted components

• d) To reduce the sample into atomic state

Which of the following is the function of Flame or Emission system in Atomic Absorption Spectroscopy?

• a) To split the beam into two

• b) To break the steady light into pulsating light

• c) To filter unwanted components

• d) To reduce the sample into atomic state

Atomic absorption spectroscopy is also called as Absorption Flame Photometry.

• a) True

• b) False

Which of the following is not a component of the emission system in a Flame photometer?

• a) Burner

• b) Atomiser

• c) Fuel gases and their regulation

• d) Chopper

Which of the following is the function of atomiser in the emission system of Atomic Absorption Spectroscopy?

• a) To split the beam into two

• b) To break the steady light into pulsating light

• c) To break large mass of liquid into small drops

• d) To reduce the sample into atomic state

Which of the following is not a fuel used in flame photometry?

• a) Acetylene

• b) Propane

• c) Hydrogen

• d) Camphor oil