Weegy: When an electron is displaced in a semiconductor, the hole that's left behind is attracted to the negative terminal of the voltage source.
User: In a cathode ray tube, the number of electrons that reach the fluorescent screen is controlled by the
A. anode.
B. grid.
C. cathode.
D. deflecting plate
Weegy: In a cathode ray tube, the number of electrons that reach the fluorescent screen is controlled by the
grid.
User: Which of the following is true in regard to a charged atom?
A. When an atom loses an electron, it becomes an anion, which is negatively charged.
B. The number of protons and the number of electrons within the same atom are unequal.
C. The magnitude of the negative charge is equal to the magnitude of the positive charge.
D. When an atom gains an electron, it becomes a cation, which is positively charged.
Weegy: The number of protons and the number of electrons within the same atom are unequal is true in regard to a charged atom.
User: Which of the following frequencies falls in the range of RF waves used by commercial radio broadcasting stations?
A. 60 Hz
B. 6,000 Hz
C. 6,000,000 Hz
D. 600,000 Hz
Weegy: 6000 Hz is within the range used by commercial radio broadcasting stations.
User: A current of 9 A flows through an electric device with a resistance of 43 . What must be the applied voltage in this particular circuit?
A. 4.8 A
B. 387 V
C. 387 A
D. 4.8 V
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