Even when no radioactive substances are present near a Geiger counter, it always shows a reading. This is due to the presence of _________ radiations.

cosmic

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background

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light

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radio

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Solution

The correct option is B background
B
The Geiger counter is an instrument used for detecting and measuring radiation. It detects ionizing radiation such as alpha particles, beta particles and gamma rays using the ionization effect produced in a Geiger-muller tube. A Geiger - mullar tube and counter set up in the laboratory may record a background radiation of 25 counter per second. These are low level radiation around us.

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