Calculate de Broglie wavelenght of: (a) rifle bullet of a mass 0.02kg which is moving at a speed of 300m/s

The de Broglie wavelength can be calculated using the formula:

λ = h / mv

where:
λ = de Broglie wavelength
h = Planck's constant (6.626 x 10^-34 m^2 kg / s)
m = mass of the object
v = velocity of the object

Given:
m = 0.02 kg
v = 300 m/s

Plugging in the values:

λ = (6.626 x 10^-34) / (0.02 * 300)
λ = (6.626 x 10^-34) / 6
λ = 1.104 x 10^-34 / 6
λ ≈ 1.844 x 10^-35 m

Therefore, the de Broglie wavelength of a rifle bullet with a mass of 0.02 kg moving at 300 m/s is approximately 1.844 x 10^-35 meters.