Read the following case and answer the following questions:
Prerna enjoys running and has recently won a \(100\)-metre sprint at the district level. While watching old Olympic races, she noticed that the timings were measured so precisely that even when two runners appeared to cross the finish line together, the winner could still be identified. This made her curious about how people measured time before modern clocks and electronic timers were invented.
One day, her teacher explained that ancient people observed repeating events in nature, such as the rising and setting of the Sun, phases of the Moon, and changing seasons. They first developed calendars and later invented devices such as sundials, water clocks, hourglasses, and candle clocks to measure shorter intervals of time. As the need for accurate timekeeping increased, mechanical clocks and later the pendulum clock were developed.
One day, her teacher explained that ancient people observed repeating events in nature, such as the rising and setting of the Sun, phases of the Moon, and changing seasons. They first developed calendars and later invented devices such as sundials, water clocks, hourglasses, and candle clocks to measure shorter intervals of time. As the need for accurate timekeeping increased, mechanical clocks and later the pendulum clock were developed.
1. Prerna's teacher asks her to identify the natural event that formed the basis for defining one day. Which observation should she select?
2. Prerna learns that an early flowing water clock became less accurate as more water flowed out of the vessel. What was the main reason?
3. Prerna wants to measure a fixed interval of time without using sunlight, water, or electricity. Which device would be most suitable?
4. Prerna's uncle uses a special watch that announces the time when a button is pressed. Which quality of such a watch makes it particularly useful for a person who cannot depend on reading a conventional clock face?