In water pipes, _ is used to detect leakages.
Correct answer: B. Radiation
- A. Light
- B. Radiation
- C. Current
- D. None of these
Explanation
Substances that emit gamma radiation are used as tracers. To find a leak or blockage, the radioactive material is put into one end of the pipe. A radiation detector outside the pipe or above ground is used to track its progress through the pipe. The leak or blockage is discovered by finding where the amount of radiation detected decreases.
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About Alternating Current
Alternating current varies periodically, so phase relationships become essential when current passes through a resistor, capacitor or inductor. The chapter distinguishes resistance from capacitive and inductive reactance, explains phase lead and lag, and connects changing electric and magnetic fields with the production and properties of electromagnetic waves.
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