Question

A 1.0 kg object moving at 4.5 m/s has a wavelength of:
A) 1.5 × 10-34 m

B) 2.9 × 10-33 m

C) 7.4 × 10-35 m

D) 1.4 × 10-34 m

E) 2.9 × 10-34 m

Answer 1

By wave particle  duality.

Wavelength , λ = h / mv

where h = Planck's constant = 6.63 * 10⁻³⁴ Js,  m = mass in kg,  v = velocity in m/s.
m = 1kg,  v = 4.5 m/s

λ = h / mv

λ = (6.63 * 10⁻³⁴) /(1*4.5)

λ ≈  1.473 * 10⁻³⁴  m

Option D.