Question

Find the potential difference through which electron must be accelerated if we wish to resolve the diameter of virus 32 nm

Answer 1

Answer:

The de-broglie wavelength of a particle with momentum p is λ=

p

h

⟹p=

λ

h

Hence the kinetic energy of the particle=

2m

p

2

=

2mλ

2

h

2

Hence the kinetic energy of the electron=

2m

e

eλ

e

2

h

2

eV

=150eV