Question

question 6 of 10
what did robert millikan discover?
a. he discovered that electrons orbited inside an atom.
b. he determined the radius of oil drops.
c. he determined an electrons charge.
d. he discovered the nucleus of the atom.

Explanation:

Robert Millikan conducted the oil - drop experiment. In this experiment, he was able to measure the charge of an electron.

• Option A: The idea that electrons orbited inside an atom was part of the Bohr model (Niels Bohr's work, not Millikan's).
• Option B: While the oil - drop experiment involved oil drops, the main discovery was the electron's charge, not just the radius of oil drops.
• Option D: The discovery of the nucleus of the atom was done by Ernest Rutherford.

Answer:

C. He determined an electron's charge.