Measure the distance across the shaft hole of the pulley with a measuring tape. Divide this by two with your calculator. If the shaft hole is 1 inch wide, then: 1 divided by 2 equals 1/2. Add the distance from the edge of the shaft hole to 1/2 the distance across the shaft hole: 6 plus 1/2 equals 6 1/2. Multiply the result by 2: 6 1/2 times 2 equals 13, the size of the pulley. A 13-inch pulley is suitable for use with ropes 1.6 inches in diameter, or line commonly sized as 1 1/2-inch line.
Different materials have different values of work function. Generally, elements with low I.P values have low work function such as Li, Na, K, Rb, and Cs. The negative potential of the plate 'C' at which the photo electric current becomes zero is called stopping potential or cut-off potential. Stopping potential is that value of retarding potential difference between two plates which is just sufficient to halt the most energetic photo electrons emitted.
ACTION POTENTIAL. An action potential is a very rapid change in membrane potential that occurs when a nerve cell membrane is stimulated. Specifically, the membrane potential goes from the resting potential (typically -70 mV) to some positive value (typically about +30 mV) in a very short period of time (just a few milliseconds).