Physics

Problem

The wavelength of electrons accelerated from rest through a potential difference of 40 kV is

x \times 10^{-12}

m. The value of

x

is ________. (Nearest integer) Given: Mass of electron =

9.1 \times 10^{-31}

kg Charge on an electron =

1.6 \times 10^{-19}

C Planck's constant =

6.63 \times 10^{-34}

Js [Main July 20, 2021 (II)]