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In absorption meter, the change in thickness of aluminium required for different samples is a function of the difference in which of the following parameters?

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In absorption meter, the change in thickness of aluminium required for different samples is a function of the difference in which of the following parameters?

(a) Amount

(b) Concentration

(c) Colour

(d) Composition

The question was asked in an international level competition.

Question is from X-Ray Absorption Meter in section X-Ray Spectrometers of Analytical Instrumentation

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Correct answer is (d) Composition

Easiest explanation: In absorption meter, the change in thickness of aluminium required for different samples is a function of the difference in composition. A variable thickness attenuator used allows this function.

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