Frank E. Jablonski, 84, a former physicist with several government agencies, died Oct. 10 at Suburban Hospital in Bethesda after a stroke.

Mr. Jablonski, who retired in 1973 as a technical adviser in the office of the chief of naval operations, lived in Bethesda for about four decades.

He was born in Brooklyn, N.Y., and was a 1936 physics graduate of Fordham University. He received a master's degree in physics from New York University and a master's degree in communications engineering from Harvard University.

During World War II, Mr. Jablonski served in the Navy in the Pacific theater. He retired as a lieutenant from the Navy reserve in the early 1950s.

He worked for the Naval Ordnance Laboratory, the Navy's special projects office, the National Security Agency and National Aeronautics and Space Administration.

He was a fellow of the American Association for the Advancement of Science and a member of the American Physical Society, Bethesda-Chevy Chase Camera Club, North Bethesda Camera Club and the Wilderness Society.

Survivors include his wife of 49 years, Dorothy E. Jablonski of Bethesda; three sons, Dan, of Silver Spring, Tim, of Stillwater, Minn., and Mike, of River Heights, Utah; a brother; and three grandchildren.