If electron are accelerated from rest through a potential difference of 10kv, what is the wavelength of the associated electron?
[m = 9.1 x 10\(^{-31}\)kg, e = 1.6 x 10\(^{-19}\)C, h = 6.6 x 10\(^{-34}\)js]
A
1.22 x 10-11m
B
3.87 x 10-10m
C
2.27 x 1011m
D
2.27 x 1014m
Verified Correct Answer: A.
Physical Principles & Numerical Solution
\(\lambda\) = \(\frac{h}{\sqrt{2evm}}\)
= \(\frac{6.6 \times 10^{34}}{\sqrt{ 2 \times 1.6 \times 10^{-19} \times 10000 \times 9.1 \times 10^{-31}}}\)
= 1.223 x 10\(^{-11}\)m
Source: WAEC / JAMB / NECO Classroom Archive (Record #14493)