Physics
JAMB 1999
What is the speed of a particle of mass 10
-27kg whose wavelength is 10
-8m.
[h = 6.63 x 10
-34Js]
-
A.
6.63ms-1
-
B.
66.30ms-1
-
C.
663.00ms-1
-
D.
6630.00ms-1
Correct Answer: Option B
Explanation
Energy of a particle is given by
E = hf = hV/λ (since V = fxλ)
But in terms of mass M, E = ∆MV2
∴ ∆MV2 = hV/λ
∆MV = h/λ
∴ V = h/λ∆M
V = 6.63 x 10-34/(10-27 x 10-8)
V = 6.63 x 10-34/10-35
V = 6.63 x 10-34+35
V = 6.63 x 10
V = 66.3ms-1
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