The power dissipation in a transistor is the product of collector current and collector to emitter voltage.

Explanation:
Transistors are electronic devices that are used for amplifying or switching electronic signals and power. They consist of three terminals - the emitter, the base, and the collector. Power dissipation refers to the amount of power that is converted into heat energy and dissipated from the transistor during its operation.

In a transistor, power dissipation occurs primarily in the form of heat due to the flow of current through it. The power dissipated in a transistor can be calculated using the formula P = I * V, where P is the power dissipation, I is the current flowing through the transistor, and V is the voltage across the transistor.

Now let's analyze the options given:

a) Emitter current and emitter to base voltage: This option is incorrect because the emitter current and emitter to base voltage do not directly contribute to power dissipation in a transistor. The emitter current determines the amount of current flowing through the transistor, while the emitter to base voltage controls the transistor's operation.

b) Collector current and collector to emitter voltage: This option is correct. The collector current is the current flowing through the collector terminal of the transistor, and the collector to emitter voltage is the voltage across the collector and emitter terminals. The product of these two quantities gives the power dissipation in the transistor.

c) Emitter current and collector to emitter voltage: This option is incorrect because the emitter current and collector to emitter voltage do not directly contribute to power dissipation in a transistor.

d) None of the above: This option is incorrect because the correct answer is option B, as explained above.

In conclusion, the power dissipation in a transistor is determined by the product of the collector current and the collector to emitter voltage.