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Sahay Sir > Question Answers > NCERT Exemplar Class 11 > Physics > Chapter 13 - Oscillations > As a graph are plot between displacement versus time we shall check for repetition to ascertain whether periodic or not. Also the minimum time span after which the plot repeats itself will be time period of the motion.

As a graph are plot between displacement versus time we shall check for repetition to ascertain whether periodic or not. Also the minimum time span after which the plot repeats itself will be time period of the motion.

In Millikan's oil drop experiment The cylindrical tube of a spray pump has a cross-section of 8.0 cm^2 one end of which has 40 fine holes each of diameter 1.0 mm. If the liquid flow inside the tube is 1.5 m min^−1 Two narrow bores of diameters 3.0mm and 6.0 mm are joined together to form a U-shaped tube open at both ends. If the U-tube contains water what is the speed of ejection of the liquid through the holes ?