How many drops did Millikan use?
Millikan’s paper of 1913 reported on 58 drops. He stated “that this is not a selected group of drops, but represents all the drops experimented upon during 60 consecutive days.”
Who did the oil drop experiment?
Robert Millikan’s
What is the negative effect of space charge?
The electrons emitted from the cathode of a thermionic converter require a finite time to reach the anode, and therefore a negatively charged electron cloud forms in the inter-electrode space. This negative space charge produces an added potential barrier that impedes the emitted electrons from reaching the anode.
How is space charge calculated?
As an application example, the steady-state space-charge-limited current across a piece of intrinsic silicon with a charge-carrier mobility of 1500 cm2/V-s, a dielectric constant of 11.9, an area of 10−8 cm2 and a thickness of 10−4 cm can be calculated by an online calculator to be 126.4 μA at 3 V.
How is space charge created?
These electrons form a cloud around the cathode, the cloud being continually depleted by electrons going to the plate and replenished by electrons emitted from the cathode. It is this cloud of electrons that produces the negative space charge.
What is space charge Polarisation?
Interfacial or space charge polarization occurs when there is an accumulation of charge at an interface between two materials or between two regions within a material because of an external field. This can occur when there is a compound dielectric, or when there are two electrodes connected to a dielectric material.
What is space charge width?
In semiconductor physics, the depletion region, also called depletion layer, depletion zone, junction region, space charge region or space charge layer, is an insulating region within a conductive, doped semiconductor material where the mobile charge carriers have been diffused away, or have been forced away by an …
What affects charge density?
The factors playing into the strength of an ion’s charge density are therefore the charge of the ion (e.g. 2+ for Mg, 1+ for Na) and the effective volume which that charge acts over – which is where the ionic radius comes in. (Note this is different to atomic radius.)