The radius of a typical atomic nucleus is approximately 2 × 10-15 m. The radius of a typical atom is approximately 2 × 10-10 m. A student builds a scale model of the atom. In this model, they represent the nucleus with a small marble of radius 5 mm. Which of the following would best represent the radius of the atom on this same scale?
A classroom of radius 5 m5\text{ m}5 m
A school running track of radius 50 m50\text{ m}50 m
A city park of radius 500 m500\text{ m}500 m
A national forest of radius 50 km50\text{ km}50 km