Question

8) Electrons are accelerated through an electric
1 point
potential V and then fall on a pair of slits that
have a separation of 100 nm. The resultant
interference pattern indicates that the electrons have
a wavelength of 1 nm. i) What is the value of the
accelerating electric potential V? ii) After passing
through the slits what is the minimum spread in the
electron's momentum in the direction parallel to the
plane of the slits and perpendicular to the average
path of the electrons? Assume h = 6.626 x 10-34 J.S
and electron mass, m = 9.11 x 10-31 kg. Ignore any
relativistic effect.
a) i) 1 Vii) infinity
b) i) 1 V ii) zero
c) i) 1.5 Vii) 10.54e-28 kg.m/s
d) None of these​

Answer 1

Answer:

I got 1.5V for first one but second did not get an answer

I think it should be d as electrons momentum will be spread till infinity on both sides of principal axis.