Part C: Communication Questions 1. Recall the motor principle. In what three ways can the magnetic force be increased? [3 marks] 2. Differentiate between the pitch, the intensity, and the quality of sound produced by a musical instrument. [3 marks] 3. A wave crest is travelling along a heavy medium. The wave crest encounters a junction between the heavy medium and a light medium. Sketch the situation after the wave crest has passed through the junction. [2 marks] incident pulse Slower Faster medium medium