Data:
mass = 45 g = 0.045 kg
velocity = 72 m/s
Formula:
wavelength = Planck constant / (mass * velocity)
Solution:
Planck constant is 6.63 * 10^ -34 J*s
=> wavelength = 6.63 * 10 ^ -34 J*s / (0.045 kg * 72 m/s)
wavelength = 2.05 * 10^ - 34 m
Answer: 2.05 * 10 ^ -34 m
