How long would it take for sound impulse to travel through a copper rod 25 kilometer long?

The speed of sound in copper is about 3560 meters per second. To find the time it takes for a sound impulse to travel 25 kilometers through a copper rod, you can use the formula time = distance/speed. Plugging in the values, you get time = 25000 meters / 3560 m/s ≈ 7 seconds.