There must be experiments in the undergraduate thesis, but there is no experiment, so it depends on what topic you choose and whether you need to do experiments.

Choosing a topic requires experiments, so there must be experiments, not experiments. Because there is no data to support your experiment, you can't explain your topic.

But if there are some who don't need to do experiments, he may need to look up some literature and do some simulations and so on. Then you need to teach yourself the software, and then draw some conclusions through simulation, and just write what you want to write clearly.

So let's see if you have chosen a topic. If you choose a topic, let's see if you need to do an experiment on this topic. If you don't need to do experiments, ask your tutor first to see if you need to read more literature, learn some software, do some simulation or do some modeling at this stage. After all, each major has its own differences, so it's best to ask the tutor clearly to understand what needs to be done.