The oil drop experiment proved that the electric fundamental charge exists and that it is quantized. It is also referred to as the Millikan oil drop experiment after the American physicist Robert A. Millikan.
Some researchers did not believe that subatomic particles, such as electrons, actually existed. Others did believe but were unable to find out what the charge on an electron was. Millikan, along with his graduate student Harvey Fletcher, devised an experiment. They injected oil drops into an ionized chamber and then measured the charge that appeared on the drops as they fell. They found that charge appears in discrete units, which means that it is quantized. Their experiments showed that the discrete units were in integer multiples of 1.592 x 10^-19 coulombs, which is very close to today’s fundamental measurement of 1.602 x 10^-19 coulombs.Learn More
According to Concord Consortium, pith-ball, gold-leaf, and needle electroscopes measure electric charges using Coulomb electrostatic forces. Pith-ball electroscopes use attraction as a measure of charge, while gold-leaf and needle electroscopes use repulsion. These early instruments helped scientist understand and measure electric charges and polarity. Today they serve primarily as demonstration instruments.Full Answer >
Some examples of luminous objects are a burning candle, a light bulb, the sun and other stars, fluorescent materials and tube lights, among other things. Any object is considered luminous if it emits its own light, either through stored energy or energy supplied to the object, which contrasts with non-luminous objects such as the moon, wood, plastics and metals; these objects merely reflect light instead of providing their own.Full Answer >
An object is said to have uniform velocity if the direction of motion and the rate at which the object changes its position is constant. In other words, an object with uniform velocity continues to cover the same amount of distance over the same time interval without changing its direction.Full Answer >
The work of Sir Isaac Newton revolutionized science and laid the foundations of modern mathematics and physics. Among his accomplishments are the formulation of the laws of motion and gravitation, the development of calculus and the invention of the first reflecting telescope.Full Answer >