Einstein explained photoelectric effect (1905) using light quanta (photons), earning Nobel Prize. Also developed relativity. Electron: Thomson; Nuclear atom: Rutherford; Induction: Faraday. Memory aid: 'Einstein = photons + relativity'. Key contribution frequently tested in competitive modern physics history questions.
Explanation:
Leading zeros not significant. '450' has three digits, but the trailing zero after decimal is significant (4,5,0). So 3 significant figures. 0.00450 is 3 SF.
No comments yet. Be the first to start the discussion!