Question 18.11: An electron is accelerated through a potential difference of 50 V. Calculate its de-Broglie wavelength.

Question 18.12: The speed of an electron is measured to be 5×10^3 m/s to an accuracy of 0.003%. Find the uncertainty in determining the position of this electron.

Question 18.13: The life time of an electron in an exited state is about 10^-8 s. What is its uncertainty in energy during this time?