Answer - 2. Gunn diode
Gunn diode exhibits a transferred electron effect.
Solution
The detailed solution to the question, the material that exhibits the transferred electron effect, is provided here.
GaAs, the material used in Gunn diodes, have negative differential mobility, meaning that the carrier velocity decreases as the electric field increases. This phenomenon is known as the transferred electron effect.
Hence, Option (B) is the correct answer.
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