What is the de Broglie wavelength, in cm, of a 12.4−g hummingbird flying at 1.20 × 102 mph? (1 mile = 1.61 km.)?

Planck constant, h = 6.626 × 10⁻³⁴ J s
Mass, m = 12.4 g = 0.0124 kg
Speed, v = 1.20 × 10² mph = (1.20 × 10²) × (1.61 × 1000) / 3600 m/s = 53.67 m/s

de Broglie wavelength, λ = h/(mv) = 6.626 × 10⁻³⁴ / (0.0124 × 53.67) m = 9.96 × 10⁻³⁴ m = 9.96 × 10⁻³¹ cm