The gain of a bipolar transistor drops at high frequencies.

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The gain of a bipolar transistor drops at high frequencies. This is because of the—

1. Coupling and bypass capacitors
2. Early effect
3. Inter-electrode transistor capacitances
4. Coupling and bypass capacitors, and interelectrode transistor capacitances

Correct Option: A

Avalanche multiplication starts when the reverse biased collector-base voltage V_CB equals the avalanche breakdown voltage BV_CBO. We know that the maximum reverse-biasing voltage which may be applied before breakdown between the collector and base terminals of the transistor, under the condition that the emitter lead be open circuited is represented by the symbol BVC_BO. This breakdown voltage is a characteristic of a transistor alone, breakdown may occur because of avalanche multiplication of the current I_CO that crosses the collector junction.