Calculate the wavelength associated with a 20ne+ ion moving at a velocity of 2.0 × 105 m/s. the atomic mass of ne-20 is 19.992 amu.

1 atomic mass unit is equal to 1.6605 × 10⁻²⁷Kg

Mass, m = 19.992 amu = 19.992 × 1.6605 × 10⁻²⁷

= 3.321 × 10⁻²⁶Kg

Speed, v = 2.0 × 10⁵ m/s

De Brogile equation:

Wavelength = h/mv

= 6.626 × 10³⁴ / (3.321 × 10⁻²⁶ × 2.0 × 10⁵)

= 9.976 × 10⁻¹⁴ m = 0.9976 × 10⁻¹³ m = 1.0 × 10⁻¹³ m

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