In the visual model used to show the behavior of particles in hot tea and cold ice cream, the particles were represented by small blue circles. What assumptions
does this model make about the composition of matter? How do these assumptions affect
the precision of the model?
How should particles be represented in a MIXTURE?
Is the model precise?

B) a helium nucleus moving at a velocity of 1000 mph

Explanation:

According to the De Broglie relation

λ= h/mv

h= planks constant

m= mass of the body

v= velocity of the body.

As we can see from De Broglie's relation, the wavelength of matter waves depends on its mass and velocity. Hence, a very small mass moving at a very high velocity will have the greatest De Broglie wavelength.

Of all the options given, helium is the smallest matter. A velocity of 1000mph is quite high hence it will have the greatest De Broglie wavelength.