One becquerel is defined as:

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Multiple Choice

One becquerel is defined as:

Explanation:
The concept here is activity: how often radioactive nuclei decay. The becquerel is the SI unit for activity and it is defined as one decay per second. So 1 Bq means one radioactive disintegration occurs every second. The other options mix in different quantities: per minute would be 60 decays per second (not the unit of activity). A joule per second is a watt, which measures power, not decay rate. A gray per second would be a dose-rate unit (energy deposited per kilogram per second), not the number of decays per unit time.

The concept here is activity: how often radioactive nuclei decay. The becquerel is the SI unit for activity and it is defined as one decay per second. So 1 Bq means one radioactive disintegration occurs every second.

The other options mix in different quantities: per minute would be 60 decays per second (not the unit of activity). A joule per second is a watt, which measures power, not decay rate. A gray per second would be a dose-rate unit (energy deposited per kilogram per second), not the number of decays per unit time.

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