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If electron are accelerated from rest through a potential difference of 10kv, what is the...

Physics
JAMB 2008

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
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Correct Answer: Option A
Explanation

 \(\lambda\) = \(\frac{h}{\sqrt{2evm}}\)

= \(\frac{6.6 \times 10^{34}}{\sqrt{ 2 \times 1.6 \times 10^{-19} \times 10000 \times 9.1 \times 10^{-31}}}\)

= 1.223 x 10\(^{-11}\)m

 

 

 

There is an explanation video available below.


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Explanation Video

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