Question Detail
Question
According to the 'Summary of key milestones,' in which year was the Electron Microscope discovered by Ruska?
Correct Answer
Option C is the correct answer.
Detailed Explanation
The 'Summary of key milestones' explicitly lists '1931: Electron Microscope(Ruska)'.
Hint
Look for the specific year associated with the Electron Microscope in the milestone summary.