Oil Drop Experiment

Question 1

What type of radiation did Millikan use to ionize the air in the chamber?

Answer 1

x-rays

Question 2

What did electrons from the ionized air do to the oil drops?
a
attached to them

b
were repelled by them

c
collided with them

d
vaporized them

Answer 2

attached to them

Question 3

What is the SI unit of electrical charge?

Answer 3

coulomb

Question 4

Millikan used ___

drops to pick up static charges.

Answer 4

oil

Question 5

It takes approximately ______ electrons to equal the mass of one proton.

Answer 5

1840

Question 6

What conclusion did scientists come to as a result of the extremely small mass of the electron compared to the mass of a hydrogen atom?

Answer 6

Atoms must contain a positively charged particle that is much more massive than the electron.

Question 7

Millikan’s determination of the mass of the electron led scientists to assume what?

Answer 7

atoms must contain another particle that carries a positive charge and is far more massive than the electron.

Question 8

Millikan used
___
in his apparatus to study electron charge

Answer 8

oil

Question 9

A coulomb is one ampere/second

Answer 9

True

Question 10

It was Millikan, rather than Thomson, who discovered the exact charge on an electron.

Answer 10

true

Question 11

Millikan’s experimental determination of the charge of the electron was accurate to within 1 % of the true value.

Answer 11

true

Question 12

In the Millikan oil drop experiment, the oil drops were measured by passing between two charged plates.

Answer 12

True

Question 13

When Millikan learned physics in college, there was no faculty to teach him.

Answer 13

true