Question

The speed of electron having de Broglie wavelength of 10 ^-10 m is ______ 
(m_e = 9.1 × 10^-31 kg, h = 6.63 × 10^-34 J-s) 

Options

• 7.28 × 10⁶ m/s 

• 4 × 10⁶ m/s

• 8 × 10⁵ m/s 

• 5.25 × 10⁵ m/s 

Answer 1

The speed of electron having de Broglie wavelength of 10 ^-10 m is 7.28 × 10⁶ m/s.