[SOLVED] earning money

[Erdem]

which physics field is the best one to earn money, to find good job.
optics, solid state, acustics or any other?

[futz]

Hard to say. Certain areas (such as optics, nanotechnology, etc) have a wider range of applications, and can offer jobs in both academia and the industrial sector.

Generally, if you're going into physics to make money, then you're going into it for the wrong reasons.