Which of the following describes a waterfall display?
The correct answer is C: Frequency is horizontal, signal strength is intensity, time is vertical. What describes a waterfall display is frequency is horizontal, signal strength is intensity, time is vertical. Waterfall displays show frequency on X-axis, time on Y-axis, and signal strength as color/intensity. For amateur radio operators, this is how waterfall displays work. Understanding this helps when using waterfall displays.
Exam Tip
Waterfall display = frequency horizontal, strength intensity, time vertical. Think 'W'aterfall = 'W'idth (frequency) horizontal, 'H'eight (time) vertical, 'C'olor (strength) intensity. Frequency on X-axis, time on Y-axis, strength as color/intensity. Not other axis combinations - just frequency horizontal, time vertical, strength intensity.
Memory Aid
"Waterfall display = frequency horizontal, strength intensity, time vertical. Think 'W'aterfall = 'W'idth horizontal, 'H'eight vertical, 'C'olor intensity. Frequency on X-axis, time on Y-axis, strength as color/intensity. Standard waterfall display format."
Real-World Application
A waterfall display: Frequency is shown horizontally (left to right), time flows vertically (top to bottom like a waterfall), and signal strength is shown as color intensity (bright = strong, dim = weak). This is how waterfall displays work - frequency horizontal, time vertical, strength as intensity.
Key Concepts
Why Other Options Are Wrong
Option A: Incorrect. Frequency horizontal, strength vertical, time intensity is wrong - strength is intensity, not vertical, and time is vertical, not intensity. Axis assignment is wrong.
Option B: Incorrect. Frequency vertical, strength intensity, time horizontal is wrong - frequency is horizontal, not vertical, and time is vertical, not horizontal. Axis assignment is wrong.
Option D: Incorrect. Frequency vertical, strength horizontal, time intensity is wrong - frequency is horizontal, strength is intensity, time is vertical. Axis assignment is wrong.
题目解析
The correct answer is C: Frequency is horizontal, signal strength is intensity, time is vertical. What describes a waterfall display is frequency is horizontal, signal strength is intensity, time is vertical. Waterfall displays show frequency on X-axis, time on Y-axis, and signal strength as color/intensity. For amateur radio operators, this is how waterfall displays work. Understanding this helps when using waterfall displays.
考试技巧
Waterfall display = frequency horizontal, strength intensity, time vertical. Think 'W'aterfall = 'W'idth (frequency) horizontal, 'H'eight (time) vertical, 'C'olor (strength) intensity. Frequency on X-axis, time on Y-axis, strength as color/intensity. Not other axis combinations - just frequency horizontal, time vertical, strength intensity.
记忆口诀
Waterfall display = frequency horizontal, strength intensity, time vertical. Think 'W'aterfall = 'W'idth horizontal, 'H'eight vertical, 'C'olor intensity. Frequency on X-axis, time on Y-axis, strength as color/intensity. Standard waterfall display format.
实际应用示例
A waterfall display: Frequency is shown horizontally (left to right), time flows vertically (top to bottom like a waterfall), and signal strength is shown as color intensity (bright = strong, dim = weak). This is how waterfall displays work - frequency horizontal, time vertical, strength as intensity.
错误选项分析
Option A: Incorrect. Frequency horizontal, strength vertical, time intensity is wrong - strength is intensity, not vertical, and time is vertical, not intensity. Axis assignment is wrong. Option B: Incorrect. Frequency vertical, strength intensity, time horizontal is wrong - frequency is horizontal, not vertical, and time is vertical, not horizontal. Axis assignment is wrong. Option D: Incorrect. Frequency vertical, strength horizontal, time intensity is wrong - frequency is horizontal, strength is intensity, time is vertical. Axis assignment is wrong.
知识点
Waterfall display, Frequency horizontal, Signal strength intensity, Time vertical
Verified Content
Question from official FCC General Class question pool. Explanation reviewed by licensed amateur radio operators.