Paul Langevin (23 January 1872 – 19 December 1946) was a French physicist who was active at the beginning of the 20th century.

He invented sonar and worked with Albert Einstein.
Paul Langevin (23 January 1872 – 19 December 1946) was a French physicist who was active at the beginning of the 20th century.
He invented sonar and worked with Albert Einstein.
Paul Langevin