Detailed explanation and options for the selected question.
What does a Geiger counter measure?
A.
Radioactivity
B.
Water purity
C.
Sound decibels
D.
Magnetic fields
Explanation:
A Geiger counter detects and measures ionizing radiation (radioactivity). Water purity is measured by TDS or other methods, decibels by a sound level meter, magnetic fields by a gaussmeter.