Can light cause the rubber to become solid? Why or why not? Does it matter what type of light she shines on the rubber?

Yes, ultraviolet light can turn a rubber into solid by evaporating volatile organic polymers.

A rubber elastic material, allows it to be deform by an external force but takes its original shape when the force is removed.  

Most of light do not cause hardness of a rubber. But ultraviolet light can cause rubber to become solid  after a prolonged exposure because UV has more energy than visible light.

A prolong exposure of UV light to rubber cause of the evaporation of volatile polymer material. Ultraviolet light are known to cause a rubber to become solid.

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Yes, ultraviolet light can turn a rubber into solid due to prolong exposure.

Explanation:

A rubber is a material with an elastic property, causing it to be deform by an external force but takes its shape when the force is removed. Light is an electromagnetic wave which causes the sensation of vision. It transfers energy to a medium during propagation through the medium.

Generally, most light do not cause hardness of a rubber. But an ultraviolet light can cause rubber to become solid over a period of time. This is possible if there is a prolong exposure of the rubber, and because of the evaporation of volatiles in the polymer material. Ultraviolet light are known to cause a rubber to become solid.

the answer is neither ball has a charge.

because if they were both positively charged, they will repel each other.

if they were positively and negatively charged, they will seek.