Rank these objects on the basis of their wavelength. (largest to smallest)person

red light > electron > proton > baseball > person > car

Explanation:

To calculate the wavelength associated to each object, you use the Broglie's relation:

h: Planck,s constant = 6.62*10^-34 Js

m: mass

v: velocity

For each object you use an average values of its mass.

person:

mass = 80kg

electron:

mass = 9.1*10^{-31}kg

red light:

In this case you use the following formula:

proton:

mass = 1.67*10^{-27}kg

car:

mass = 1500kg

baseball:

mass = 0.145kg

hence, by comparing the wavelengths of the objects you have:

red light > electron > proton > baseball > person > car