Since I like data (something I picked up during my graduate school years that were, according to certain embittered individuals on this site, otherwise wasted), I checked my undergrad alma mater's alumni directory for the years around my own graduation. I looked for people who majored only in physics (no CS or engineering double majors), who had reported on their employment, and who didn't have any other degrees reported (generally people who update their profile with jobs will also update their further education). I also did a quick Google search to try to make sure (generally via LinkedIn profiles) that they had no other degree; plus I knew most of these people and whether they went to grad school (immediately out of undergrad, at least).
I found 15 people, whose most recently reported jobs break down as:
Four engineers of other stripes
Two defense analysts
One technician/facilities manager at a national lab
One active duty military
And, by the way, teaching high school generally requires an additional credential
, but not another degree
, and for high-demand subjects some states and private schools will let one pick up that creditional after being conditionally hired.