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Per NCERT, which of the following is the correct mass of the electron derived from Millikan's e and Thomson's e/m_e?
A1.6726 × 10⁻²⁷ kg
B1.6749 × 10⁻²⁷ kg
C6.022 × 10²³ kg
D9.1094 × 10⁻³¹ kg
Answer & Solution
Correct answer: D. 9.1094 × 10⁻³¹ kg
Per NCERT eqn 2.2, m_e = e ÷ (e/m_e) = 1.602 × 10⁻¹⁹ ÷ 1.7588 × 10¹¹ = 9.1094 × 10⁻³¹ kg. Others are m_p, m_n, N_A.
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