Why is the sound in one ear only?
It's probably a broken wire.
First, make sure it happens with those headphones no matter what you plug them into. If you're using them on your computer, try plugging them into your phone or someone else's computer. If you're using the quarter-inch adapter, try plugging into something that will take the eight-inch plug (the picture I'm seeing of your headphones shows an eighth-inch plug with a quarter-inch adapter). If the problems goes away, then it's either the adapter or the audio jack on the original device. But a new quarter-inch adapter online or at your local Radio Shack. If that doesn't fix it, then the jack on your device is shot, and your best bet is probably to get a new device. (Before I spent the money on a new device, I'd borrow another set of headphones, just to be sure that the problem persists no matter what headphones you use.) If the device is a computer, then you can buy a USB sound card (which plugs into a USB port and has mike and headphone jacks on the other end) instead of replacing the whole computer.
But it's more likely that the problem will persist no matter what you plug into, and it's your headphones. It's probably a broken wire; sometimes if you jiggle the wires going into the dead earpiece, you'll get crackling to confirm this diagnosis. But it doesn't really matter why the headphones don't work; no matter what's broken, the repair is more expensive than replacement. Time for new headphones.
The above answer assumes that you are listening to a stereo sound source. In addition to trying your headphones on another device, you should make sure you're listening to a stereo sound.
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