AP Physics 1 Question 156: Answer and Explanation

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Question: 156

6. The charge on an oil drop is measured in the laboratory. Which of the following measurements should be rejected as highly unlikely to be correct?

  • A. 6.4 × 10–19 C
  • B. 8.0 × 10–19 C
  • C. 4.8 × 10–19 C
  • D. 2.4 × 10–19 C

Correct Answer: D

Explanation:

D-All experimental evidence in existence shows that the smallest unit of isolated charge is the electron charge e = 1.6 × 10–19 C. The charge measured in A is equivalent to 4 fundamental charges; in B, 5 fundamental charges; and in C, 3 fundamental charges. But choice D would require an isolated charge of 1.5 e, which is not possible.