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Wavelength of an electron is 5Aº. Velocity of the electron is

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1.45 × 10⁸ cm/s

1.6 × 10^–8cm/s

3.2 × 10^–27cm/s

3.2 × 10²⁷cm/s

answer is A.

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Detailed Solution

$λ = \frac{h}{mv}$

m_e = 9.1 × 10^-28 g

λ = 5 × 10^-8 cm

$v = \frac{h}{m} \times \frac{1}{λ}$

$\Rightarrow v = \frac{6.625 \times 10^{- 27} erg \cdot \sec}{9.1 \times 10^{- 28}} \times \frac{1}{5 \times 10^{- 8}}$

v_e = 1.45 × 10⁸ cm

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