Which one of the following is the unit of activity of a radioactive source?

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Q: 35 (NDA-II/2008)

Which one of the following is the unit of activity of a radioactive source?

question_subject: 

Science

question_exam: 

NDA-II

stats: 

0,22,14,5,22,8,1

keywords: 

{'radioactive source': [0, 0, 1, 0], 'unit': [0, 1, 5, 10], 'lux': [0, 0, 1, 0], 'activity': [3, 0, 1, 3], 'siemens': [0, 0, 2, 0], 'tesla': [0, 0, 1, 2], 'becquerel': [0, 1, 1, 0]}

The correct answer is option 2, Becquerel.

Option 1, Lux, is a unit of illuminance, which measures the amount of light per unit area. It is not a unit of activity for a radioactive source.

Option 3, Tesla, is a unit of magnetic field strength. It is used to measure the strength or intensity of a magnetic field, and it is not a unit of activity for a radioactive source.

Option 4, Siemens, is a unit of electrical conductance. It measures the ease with which electric current flows through a material. It is not a unit of activity for a radioactive source.

The unit of activity for a radioactive source is the Becquerel (Bq). It is named after Henri Becquerel, who discovered radioactivity. The Becquerel measures the rate at which radioactive atoms decay and emit radiation. One Becquerel is equal to one radioactive decay per second. It is used to quantify the amount of radiation emitted by a radioactive source.