When working with wave equations, students often make some common mistakes. Here are a few big ones to watch out for:

1. Mixing Up Variables: Many students confuse frequency (that's $f$), wavelength (which is $λ$), and speed (known as $v$). It's important to remember that the relationship is $v = fλ$. If you get these mixed up, your calculations can be way off.

2. Pay Attention to Units: Not converting units can lead to problems. For example, if you forget that $λ$ should be in meters and use centimeters instead, your answers won't be correct. Always check your units!

3. Forgetting the Relationships: Sometimes, students overlook how $v$, $f$, and $λ$ connect. If you increase the frequency, the wavelength will get smaller, as long as the speed stays the same!

4. Not Checking Your Work: A lot of students rush through their calculations and don't double-check their answers. Taking a moment to look over your work can catch silly mistakes that might mess up your final answer.

By understanding these common pitfalls, you can make wave problems a lot easier to handle!