Chemistry Atomic Structure BUMHS 2024
PMDC Verified Question 13 of 95
The charge of electron is:
A
\( 1.602 \times 10^{-16} \text{ C} \)
B
\( 1.602 \times 10^{-19} \text{ C} \)
C
\( 1.602 \times 10^{-17} \text{ C} \)
D
\( 1.602 \times 10^{-18} \text{ C} \)
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: \( 1.602 \times 10^{-19} \text{ C} \)
Concept: The fundamental elementary charge is the electrical charge carried by a single proton or electron.

Formula: $$e = 1.602 \times 10^{-19}\text{ C}$$

Solution:
  • Robert Millikan measured the charge of a single electron in 1909 through his famous Oil Drop Experiment.
  • He determined the elementary charge to be approximately \(1.602 \times 10^{-19}\) Coulombs (C).
  • Because an electron is negatively charged, its exact value is \(-1.602 \times 10^{-19}\text{ C}\), but questions typically ask for the magnitude.


Why other options are incorrect: The exponents \(-16\), \(-17\), and \(-18\) represent orders of magnitude that are thousands of times too large.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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