Welcome to PF;
For project in one of my classes, ...
Is this a writing class, a science class, or something else?
What level do you need the science at and how "hard" do you need it?
The trick with this sort of thing is to minimize the extraneous assumptions you need to make, especially anything supernatural.
Start by being quite blatant about what the power is in supernatural terms... then describe it phenominologically: what does it look like it does, and how does the person using the power (the super) experience it? What does it look like to other people?
I have to research a super power and a possible scientific explanation of it, showing either why it can or can't happen. I chose a super power of translating people's electro magnetic fields into frequencies, and being able to translate that into understanding their emotions.
The super-power is "reading auras"... it works off the bio-electromagnetic field, so the super can sense people EM fields.
A scientific explanation for this would answer the question "how can this person sense the field?"
I started researching the translation of electromagnetic waves into pressure waves in the fluid in which the ear is located. I am researching how electro magnetic radiation can be translated into frequencies for the human ear to perceive.
OK - so you want the person to experience the EM field of the subject as a sound... probably the most direct way to do this is to have an organ that senses the EM and stimulate the parts of the brain that deal with hearing. No need to bother with ears at all.
This reduces the problem to just detecting the EM field to start with ... no need to worry about the extra stuff of converting it into sound waves and directing those sound waves at the ears. Now there is only one thing to explain.
Range: bio-fields tend to be short range.
If you are thinking that your super is in a room with someone and they can hear their emotions, that will be a problem if they are getting the sounds off the EM fields. How are they doing this from a distance?
Maybe the super has modified nerves in their hands that detect the fields when the subject is touched and the super has learned to listen for the fluctuations that indicate different emotional states. It could work like a polygraph for detecting lies for eg. The upshot is that by touching someone, or just holding hands close by, the super can reliably guess the general emotional state and deduce other things (like lie's, who they are in love with etc) from that along with context and psychology.
Then side effects: there are other sources of EM fields ... machinery, power lines etc. The super may be able to tell that an electronic device is badly grounded because "it sounds angry"... but mostly there will be a lot of background noise about.
If you look into biofeedback and human skin EM you will get an idea of the sorts of fields involved - but you should focus on how to detect the field to start with: the super will learn how the experience relates to emotions over time like Daredevil learned to use his hearing for echo-location - sensing his surroundings.