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

If electron are accelerated from rest through a potential difference of 10kv, what is the wavelength of the associated electron
[m = 9.1 x 10-31kg, e = 1.6 x 10-19C, h = 6.6 x 10-34js]
  • A.
    1.22 x 10-11m
  • B.
    3.87 x 10-10m
  • C.
    2.27 x 1011m
  • D.
    2.27 x 1014m
Correct Answer: Option A
Explanation
λ = __h
√(2evm)
= ____6.6 x 10-34
√(2 x 1.6×10-19 x 10000 x 9.1×10-34)

1.223 x 10-11m

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