Discussion
One of the following types of noise becomes of great importance at high frequencies. It is the
Answer: D
Transit-time noise becomes important at high frequencies: when the time a carrier takes to cross a device becomes comparable to the period of the signal, the carriers do not respond in step with it and extra noise appears in transistors and tubes. Shot noise and random (thermal) noise exist at all frequencies and do not rise sharply at high frequency, and impulse noise comes from sudden disturbances and is not a high-frequency effect of the device. The answer is option D.
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