Author Question: A nonrelativistic electron is accelerated from rest through a potential difference. After ... (Read 32 times)

rmenurse · **on:** Jul 29, 2018

A nonrelativistic electron is accelerated from rest through a potential difference.

After acceleration the electron has a de Broglie wavelength of 880 nm. What is the potential difference though which this electron was accelerated? (h = 6.626 10-34 J s, e = - 1.60 10-19 C, mel = 9.11 10-31 kg)
A) 2.5 V B) 2.2 V C) 1.9 V D) 1.7 V

Question 2

An electron is released from rest at a distance of 9.00 cm from a fixed proton.

How fast will the electron be moving when it is 3.00 cm from the proton? (k = 1/40 = 8.99 109 N m2/C2, e = 1.60 10-19 C, melectron = 9.11 10-31 kg, mproton = 1.67 10-27 kg)
A) 75.0 m/s
B) 106 m/s
C) 130 m/s
D) 1.06 103 m/s
E) 4.64 105 m/s

zhanghao · **Reply #1 on:** Jul 29, 2018

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