HURRY 65

b. A guitar string has a length of 0.90 m. When you pluck it, it plays a “C” that has a frequency of 256 Hz. How fast is the wave moving back and forth along the string? (Choose one of the equations from the box at the top of the page to solve this problem.)

c. In a train track made of solid steel, sound waves travel extremely fast – about 6,000 m/s. If a train’s vibration travels for 3 seconds, how far will it move? (Choose one of the equations from the box at the top of the page to solve this problem.)