Question

Radioactivity is measured by
1. Geiger-Muller Counter
2. Polarimeter
3. Calorimeter
4. Barometer

Answer 1

Correct Answer - Option 1 : Geiger-Muller Counter

The correct answer is The Geiger-muller counter.

• The Geiger-Muller counter is used for measures the amount of ionizing radiation, of any radioactive metal.  It was originated in the year 1908.
• Basically, the instrument consists of a pair of electrodes surrounded by a gas.  The gas used is usually Argon or Helium gas. The electrodes have a high voltage across them.

• The calorimeter is used in chemical reactions to measure heat or thermodynamics.
• The polarimeter is used to measure the rotation angle by polarized light. 
• The barometer is used in measuring atmospheric pressure.