1991 AD., USSR, Moscow mint, 1 Rouble commemorative Lebedev, Y 261.

Russia, Union of Soviet Socialist Republics (USSR or, in cyrillic, CCCP), Moscow mint, commemorative issue: 125th birth anniversary of Pyotr Lebedev, designers: A.A. Novichkov, A.A. Kolodkin, 1991 AD.,
1 Rouble (31 mm / 12,65 g), copper-nickel-zinc, mintage 2.500.000 ( 350.000 specimens in proof quality ),
Obv.: П.Н. ЛЕБЕДЕВ / 1866 / 1912 / formula experimentally confirmed by Lebedev / device constructed by him to measure the pressure of light, his half-length figure standing r.
Rev.: CCCP / 1 / РУБЛЬ / 1991 , national arms with CCCP, value and year below.
Edge: ОДИН РУБЛЬ • ОДИН РУБЛЬ • ("one ruble one ruble")
Y 261 .

Pyotr Nikolaevich Lebedev (Russian: Пётр Николаевич Лебедев) was a Russian physicist. Lebedev was widely known for his research of the effects of electromagnetic, acoustic, and hydrodynamic waves on resonators.
He made his doctoral degree in Strasbourg, supervised by August Kundt in 1887–1891. In 1891 he started working in Moscow State University in the group of Alexander Stoletov. There he made his famous experimental studies of electromagnetic waves. He was the first to measure the pressure of light on a solid body during 1899. The discovery was announced at the World Physics Congress in Paris during 1900, and became the first quantitative confirmation of Maxwell's theory of electromagnetism. During 1901 he became a professor of Moscow State University, however he quit the University during 1911, protesting against the politics of the Ministry of Education. During the same year he received an invitation to become a professor in Stockholm, which he rejected. He died the next year.
The Lebedev Physical Institute in Moscow and the lunar crater Lebedev are named after him.