In cell biology, an organelle (/ÉËrÉ¡ÉËnÉl/) is a specialized subunit within a cell that has a specific function. Individual organelles are usually separately enclosed within their own lipid bilayers.
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Angular Frequency. Angular frequency, f, is defined as the number of circular revolutions in a given time interval. It is commonly measured in units of Hertz (Hz), where 1 Hz = 1 s â1. For example, the second hand on a clock completes one revolution every 60 seconds and therefore has an angular frequency of 1 / 60 Hz. = 1/f. Since we know that the frequency of the second hand is 1 / 60 Hz, we can quickly see that the period of the second hand is 60 s. It takes 60 seconds for the second hand to complete a revolution, so the period of the second hand is 60 seconds.