Answer:
1.Cover one ear. Hold the clock 5cm away from your ear. Can you hear the clock ticking?
No you can't hear the clock ticking
2. Place the water-filled ballon againts your ear. Hold the clock againts the ballon. Can you hear the clock ticking?
Yes you can hear the clock ticking
3.Place your ear againts a wooden door and the clock on the other side while covering your other ear. Can you hear the clock ticking?
Yes you can hear the clock ticking
