24 hours of daylight

When a drop of oil is spread on a water surface, it displays beautiful colours in daylight because of

Starting with a bacterium that divides once in half hour how many bacteria are formed after 24 hours of growth ?

A day consists of 24 hours. How many hours will there be in the year 2005 and 2008 and find the difference between them?

There are 24 hours in a day. What fraction of a day does 11 hours represent?

Human cells in culture, divide once in approximately every 24 hours, during this