An electron is accelerated through a potential difference of 2oo volts. If e I m for electron be 1.6x1011 coulomb/kg, the velocity acquired by the electron will be

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An electron is accelerated through a potential difference of 2oo volts. If e I m for electron be 1.6x10¹¹ coulomb/kg, the velocity acquired by the electron will be

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8 x10⁶m/s

8 x 10⁵m/s

4.9 x 10⁶ m/s

5.9 x 9⁵m/s

answer is A.

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Detailed Solution

we know that
$V = \sqrt{2 V (e / m)} v = \sqrt{[2 \times 200 \times (1.6 \times 10^{11})]} = 8 \times 10^{6} m / s$

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