In 1909, Robert Millikan and Harvey Fletcher conducted the oil drop experiment to determine the charge of an electron. They suspended tiny charged droplets of oil between two metal electrodes by balancing downward gravitational force with upward drag and electric forces.Keeping this in consideration, why is the Millikan oil drop experiment important?
Millikan's experiment is important because it established the charge on an electron. Millikan used a very simple a very simple apparatus in which he balanced the actions of gravitational, electric, and (air) drag forces.
Secondly, why clock oil is used in Millikan's oil drop experiment? The oil used in Millikan's original experiment - an oil typically used with vacuum apparatus - was specifically chosen as it had a low vapour pressure. Other oils, with higher vapour pressures, evaporated too quickly in the heat of the lights used to illuminate the drops. Water would certainly have this problem.
Beside this, what did the Millikan oil drop experiment tell us?
The Millikan Oil Drop Experiment An experiment performed by Robert Millikan in 1909 determined the size of the charge on an electron. He also determined that there was a smallest 'unit' charge, or that charge is 'quantized'. He received the Nobel Prize for his work.
What is the principle of Millikan's oil drop experiment?
Working Principle: If the oil drop moves with a constant velocity ve . Then the force due to electric field is equal to net downward force. This expression gives the charge of an oil drop. In millikan's oil drop exprement the value of q can be determined if the values of symbols are known.
What did the Millikan oil drop experiment determine?
In 1909, Robert Millikan and Harvey Fletcher conducted the oil drop experiment to determine the charge of an electron. They suspended tiny charged droplets of oil between two metal electrodes by balancing downward gravitational force with upward drag and electric forces.Which oil is used in Millikan oil drop experiment?
1 Answer. Ernest Z. Millikan used vacuum pump oil for his experiment.Why did Millikan use oil instead of water?
Professor Millikan has made several innovations to improve the experiment. First, droplets of oil are used instead of water, to reduce the tendency of the droplets to evaporate while the experiment is being performed. was later traced to the fact that Millikan's value of the viscosity of air had been a little low.What is the charge of an oil drop?
Oil drop experiment. Millikan used the information to calculate the charge of an electron. He determined the charge to be 1.5924×10−19C, where C stands for coulomb, which is one ampere/second.Will Millikan oil drop experiment work in a vacuum?
The reason for not doing it in vacuum is simply that in vacuum the speed of the drop is independant of it's mass and so there is no way to measure the mass. The terminal velocity technique is a very clever method of measuring the mass of a very small object. ps. It would be impossible to do this is a vacuum.Who was the first person to attempt to measure e?
J.J. Thomson
Why do some drops move upward?
Ernest Z. The oil drops fall so slowly (a) because they are small and (b) because they are attracted to a positive plate above them. Ionizing radiation gave the fine oil droplets a negative charge. Other drops with different masses and charges either moved upwards or continued to fall.How many electrons are in a drop of oil?
3 Answers. There does not have to be just one electron per drop. Say you have a drop which, in reality, picked up four electrons, another with five and a third drop with seven.Is an electron negative?
Electrons are the negatively charged particles of atom. Together, all of the electrons of an atom create a negative charge that balances the positive charge of the protons in the atomic nucleus. Electrons are extremely small compared to all of the other parts of the atom.Is electron positive or negative?
Proton—positive; electron—negative; neutron—no charge. The charge on the proton and electron are exactly the same size but opposite. The same number of protons and electrons exactly cancel one another in a neutral atom.How do you define charge?
Definition 2: CHARGE is an extent to which the atom has more electrons than protons. The SI unit of charge is coulomb (C). The smallest unit of charge is the charge of the electron though I doubt that because quarks are found to exist within proton and electrons withWhy charges are quantized?
Charges are quantized because the charge of any object (ion, molecule, etc.) are multiples of a fundamental quantity -- we can say that any charge can be expressed as , where is an integer, while is the fundamental unit of charge - or the elementary charge. This is the quantization of charge.What experiment did JJ Thomson do?
Summary. J.J. Thomson's experiments with cathode ray tubes showed that all atoms contain tiny negatively charged subatomic particles or electrons. Thomson proposed the plum pudding model of the atom, which had negatively-charged electrons embedded within a positively-charged "soup."Do electrons have mass?
Electrons belong to the first generation of the lepton particle family, and are generally thought to be elementary particles because they have no known components or substructure. The electron has a mass that is approximately 1/1836 that of the proton.How did they find the mass of an electron?
Historically, the mass of the electron was determined directly from combining two measurements. The mass-to-charge ratio of the electron was first estimated by Arthur Schuster in 1890 by measuring the deflection of "cathode rays" due to a known magnetic field in a cathode ray tube. It was seven years later that J. J.Why is Lycopodium powder used in the oil drop experiment?
It enables the boundary of the oil to be seen clearly. Weakens the surface area of the oil and the water so that the oil spreads to the maximum diameter.Is oil positively or negatively charged?
As for oil, it is a non-polar chemical. Since the atoms in the fatty acids in oil share their electrons nicely, they (usually) have no charge, or at least not enough to make the whole molecule polar. Given their lack of positive or negative charge, they are not attracted to a polar molecule like water. 
