Question

If the deBroglie wavelength of an electron is equal to 10^–3 times the wavelength of a photon of frequency 6 × 10¹⁴ Hz, then the speed of electron is equal to : 

(Speed of light = 3 × 10⁸ m/s Planck's constant = 6.63 × 10^–34 J.s Mass of electron = 9.1 × 10^–31 kg) 

(1) 1.7 × 10⁶ m/s 

(2) 1.1 × 10⁶ m/s 

(3) 1.8 × 10⁶ m/s 

(4) 1.45 × 10⁶ m/s

Answer 1

The correct option is (4).

Explanation: