Question

Find the de Broglie wavelength of electrons moving with a speed of 7 × 10⁶ ms ^-1. 

Answer 1

λ = de-Broglie wavelength, v = 7 × 10⁶ ms ^-1

⇒ `lambda = h/p =h/(mv)`

`= (6.6xx10^-34)/(9.1xx10^-31 xx7xx10^6)`m

`lambda = (66xx10^-9)/(91xx7)` 

`lambda = 0.1 xx 10^-9`m

`lambda` = 0.1 nm