In a lab experiment, 6300 bacteria are placed in a petri dish. The conditions are such that the number of bacteria is able to double every 8 hours. How many bacteria would there be after 19 hours, to the nearest whole number?Answer:
Q. In a lab experiment, 6300 bacteria are placed in a petri dish. The conditions are such that the number of bacteria is able to double every 8 hours. How many bacteria would there be after 19 hours, to the nearest whole number?Answer:
Calculate Doubling Periods: Determine the number of times the bacteria population will double in 19 hours.Since the bacteria double every 8 hours, we divide the total time by the doubling period.19 hours ÷8 hours per doubling period = 2.375 doubling periods.
Calculate Bacteria After Doubling Periods: Since bacteria can only double a whole number of times, we need to consider only the whole number part of the doubling periods for the calculation.The number of complete doubling periods in 19 hours is 2 (since we cannot have a fraction of a doubling period).
Calculate Remaining Time: Calculate the number of bacteria after the complete doubling periods.The population doubles 2 times, so we multiply the initial number of bacteria by 2 raised to the power of the number of doublings.6300 bacteria ×(22)=6300×4=25200 bacteria after 16 hours (2 complete doubling periods).
Calculate Growth During Remaining Time: Determine the remaining time after the last complete doubling period. 19 hours - 16 hours (2 complete doubling periods of 8 hours each) = 3 hours remaining.
Apply Growth for Partial Period: Calculate the growth of bacteria during the remaining 3 hours.Since the bacteria double every 8 hours, we can find the fraction of doubling that occurs in 3 hours by dividing 3 by 8.3 hours ÷8 hours per doubling period = 0.375 of a doubling period.
Round Bacteria Count: Apply the growth for the partial doubling period to the bacteria count after 16 hours.We need to multiply the number of bacteria after 16 hours by 2 raised to the power of 0.375 to find the number of bacteria after the remaining 3 hours.25200 bacteria ×(20.375)≈25200×1.333≈33600 bacteria after 19 hours.
Round Bacteria Count: Apply the growth for the partial doubling period to the bacteria count after 16 hours.We need to multiply the number of bacteria after 16 hours by 2 raised to the power of 0.375 to find the number of bacteria after the remaining 3 hours.25200 bacteria ×(20.375)≈25200×1.333≈33600 bacteria after 19 hours.Round the result to the nearest whole number, as bacteria count cannot be a fraction.The number of bacteria after 19 hours, rounded to the nearest whole number, is approximately 33600.
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