To double the covering range of a T.V. transmitter tower, its height should be made:
Correct answer: B. Four times
- A. Two times
- B. Four times
- C. √2 times
- D. 8 times
Explanation
This is the following solution:D=√2hr where D=range of wave transmitted, h=height of the tower.Hence we can conclude that D is directly proportional to √h therefore we have to increase the height 4 times in order to increase the distance 2 times.
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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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