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Which of the following devices can be used to measure ozone in the stratosphere from the ground?

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Which of the following devices can be used to measure ozone in the stratosphere from the ground?

(a) Spectrometer

(b) Photometer

(c) Spectrophotometer

(d) Spectro-ozonometer

The question was posed to me in an interview for job.

This key question is from Ozone Depletion in division Atmosphere & Greenhouse Gases of Environmental Engineering

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The correct option is (c) Spectrophotometer

Explanation: The spectrophotometer developed by Dobson can be used to measure ozone in the stratosphere from the ground. The amount of ozone is measured in terms of – Dobson unit.

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