Final answer:
To sketch a square wave, one must draw a series of alternating high and low value segments, with the number of cycles corresponding to the wave's frequency. Horizontal and vertical square waves differ only in the axis on which they are plotted
Step-by-step explanation:
The subject of this question is Physics, and it is best suited for a High School grade level. The student is asking how to sketch square waves with specific frequencies and also asks to describe the appearance of a square wave with a given frequency in terms of cycles per degree.
Sketching Square Waves
To answer part (a), a horizontal square wave of frequency 2 Hz means that the wave completes two cycles in one second. Sketching this would show two complete cycles (one cycle consists of one crest and one trough) along a horizontal time axis within the span of one second.
For part (b), a vertical square wave of frequency 3 Hz means the wave completes three cycles in one second, but plotted against a vertical spatial axis. You would draw three vertical lines alternating between high and low values to represent three cycles.
Describing a Square Wave
Describing a square wave with 84 cycles per degree would be challenging without a visual, but conceptually it implies a very high frequency wave where 84 complete cycles would occur within one degree of phase angle or spatial degree if projected into a space.