6. A neutron has a mass of 1.67 × 10⁻²⁷ kg. The de Broglie wavelength is 1.4 × 10⁻¹⁰ m. How fast is the neutron going (in m/s)?
(A) 3.4 × 10³
(B) 2.8 × 10³
(C) 3.9 × 10³
(D) 2.6 × 10³
(E) 1.7 × 10³

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