Question

Which notes show that Carla's bicycle is in motion?

1) The sound of the bicycle bell
2) The movement of the pedals
3) The color of the bicycle
4) The size of the bicycle

Answer 1

The notes indicating that Carla's bicycle is in motion are the sound of the bicycle bell and the movement of the pedals, which are indicators of motion similar to the Doppler effect.

Step-by-step explanation:

The notes that show Carla's bicycle is in motion are the sound of the bicycle bell and the movement of the pedals. The sound of the bell can be similar to the characteristic shift in frequency observed in the Doppler effect, where the pitch of the sound increases as the source approaches and decreases as it moves away. Similarly, the movement of the pedals indicates physical action that would propel the bicycle forward, signaling motion. On the other hand, the color and the size of the bicycle do not provide information about its motion.