Hydrogen will only absorb specific colors of light. what does that say about the structure of an atom?

The fact that only certain colors appear in an element's atomic emission spectrum means that only certain frequencies of light are emitted. The electrons in atoms are a different story. Electrons are attracted to the nucleus through a different fundamental force, called the electromagnetic force. This force is less intense. The electrons have a little wiggle room. An electron can absorb energy, either from colliding with another atom or by absorbing a tiny packet of light called a photon. An electron can move away from or closer to the nucleus depending on its energy.

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It shows that the experiment is designed properly.