State a problem or question to be tested to investigate the difference in the transmission of sound waves through solids and liquids.

The problem or question to be tested could be: "How does the transmission of sound waves differ between solids and liquids?"

To investigate this, you could follow these steps:

1. Hypothesis Formulation: Formulate a hypothesis based on your understanding of sound waves and their transmission through different mediums. For example, you might hypothesize that sound waves travel faster through solids than through liquids due to the closer molecular arrangement in solids.

2. Experiment Design: Design an experiment to test your hypothesis. This could involve transmitting a sound wave through a solid object and a liquid and measuring the time it takes for the sound to travel a set distance.

3. Data Collection: Carry out the experiment and collect data. This could involve using a microphone to detect the sound after it has passed through the solid or liquid and a timer to measure how long it takes.

4. Data Analysis: Analyze the data to see if it supports your hypothesis. This could involve comparing the average time it took for the sound to travel through the solid and the liquid.

5. Conclusion: Draw a conclusion based on your findings. If the data supports your hypothesis, you might conclude that sound does indeed travel faster through solids than through liquids. If the data does not support your hypothesis, you might need to revise your hypothesis and repeat the experiment.

6. Report Writing: Write a report detailing your experiment, data, analysis, and conclusion. This will allow others to understand your findings and potentially replicate your experiment.