Radioactivity is measured by

[amp_mcq option1=”GM Counter” option2=”Polarimeter” option3=”Calorimeter” option4=”Colorimeter” correct=”option1″]

This question was previously asked in

UPSC NDA-2 – 2017

Radioactivity is the spontaneous emission of radiation (alpha, beta, gamma rays) from unstable atomic nuclei. A Geiger-Muller counter (GM Counter) is a widely used instrument specifically designed to detect and measure ionizing radiation, which is characteristic of radioactive decay. It works by detecting the ionization caused by radiation passing through a gas-filled tube.

– Radioactivity involves the emission of ionizing radiation.
– A GM Counter is an instrument that detects ionizing radiation.

A Polarimeter measures the rotation of polarized light by optical active substances. A Calorimeter measures heat flow or thermal energy. A Colorimeter measures the absorbance or transmission of light by a solution at specific wavelengths to determine concentration or color properties. None of these are used to measure radioactivity. Other instruments for measuring radioactivity include scintillation counters and semiconductor detectors.

More similar MCQ questions for Exam preparation:-