Understanding Tidal Cycle Basics

Tides are the rise and fall of sea levels caused by gravitational forces exerted by the Moon and Sun. The typical tidal cycle includes:

• High Tide: The point of maximum high water level.
• Low Tide: The point of minimum low water level.
• Ebb Tide: The period when the tide water is receding or falling, occurring between High Tide and Low Tide.
• Flood Tide: The period when the tide water is rising, occurring between Low Tide and High Tide.

For most coastal locations experiencing semi-diurnal tides (two high and two low tides per day), the time between a High Tide and the next Low Tide is approximately 6 hours and 12.5 minutes ($\approx 6$ hours $12$ minutes $30$ seconds).

Calculating Ebb Tide Timing

The question states a place is affected by Tide at 6:00 AM Monday. Assuming this refers to High Tide, we can calculate the approximate time of the subsequent Low Tide, which marks the end of the Ebb phase.

1. Initial High Tide Time: Monday, 6:00 AM.
2. Time Interval: The time from High Tide to Low Tide is approximately $6$ hours $12.5$ minutes.
3. Low Tide Calculation: Add the interval to the High Tide time:

   $ 6:00 \text{ AM Monday} + 6 \text{ hours } 12.5 \text{ minutes} = 12:12:30 \text{ PM Monday} $

4. Conclusion: The Ebb phase concludes at approximately 12:12:30 PM Monday. Among the given options, 12:13 PM Monday is the closest approximation. Therefore, the place will be affected by Ebb around this time, marking the end of the ebb tide cycle.