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NEET 1991 (AIPMT) · Other / Mixed: Atoms & Bohr Links

Other / Mixed: Atoms & Bohr Links question from NEET 1991 (AIPMT)

Q11NEET 1991 · AIPMTEasy

Other / Mixed: Atoms & Bohr Links

An electron with (rest mass $m_0$ ) moves with a speed of $0.8\,c$ . Its mass when it moves with this speed is

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Answer: (c)

$m = \frac{m_0}{\sqrt{1 - v^2/c^2}}$
$\sqrt{1 - 0.64} = 0.6$
$m = \frac{m_0}{0.6} = \frac{5m_0}{3}$
So the answer is (c) $\frac{5m_0}{3}$ .

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