That are easy to understand, and yet informative?
No idea if it’s any good—I just did an Amazon search, but it has good reviews and you can get it for really cheap used. http://www.amazon.com/Physics-Sound-2nd-Richard-Berg/dp/0131830473
Is there something specific you want to study?. I do quite a bit with ultrasonics and use the beat frequencies to do interesting tasks.
Yes, Isaac Asimov wrote several good, easy to understand books on science.
Several can be found by the industry publisher focalpress.com