The ______ indicates the number of pulses transmitted on each scan line in the color image.

• A. PRF
• B. Gain
• C. Packet size
• D. Threshold

Answer: (C)

The key idea here is how color image data is structured and sent line by line. Each scan line’s data is broken into packets, and the amount of data packed into each line’s packet sets how many pulses (samples) are transmitted along that line. That is why the packet size determines the number of pulses per scan line: a larger packet carries more samples and thus more pulses for that line, while a smaller packet carries fewer.

The other options relate to different aspects of imaging: PRF is the rate at which pulses are emitted per second and affects how often lines are acquired; gain adjusts amplification of the signal; threshold is a processing limit used during detection or decision steps. None of these directly control how many data pulses are sent per scan line in the color image, which is governed by the packet size.