Question: What is the birthdate of this Indian experimental physicist and retired professor, who wrote Concepts of Physics?

Context articles: Julius Ashkin
H. C. Verma
Hamish Robertson
Girsh Blumberg
Duncan G. Steel
Concepts of Physics
R. S. Krishnan
Wilhelm Hanle
Johannes Juilfs
Chien-Shiung Wu

Julius Ashkin (August 23, 1920 – June 4, 1982) was a leader in experimental and theoretical physics known for furthering the evolution of particle physics from nuclear physics.
 As a theoretical physicist he made contributions in the fields of statistical mechanics, solid state physics, nuclear physics, and elementary particle physics.
 As an experimental physicist his main contributions concerned the passage of certain particles (pi-mesons, or pions) through solid matter and their subsequent decay.
 He was recognized for the quality of his research and teaching.
Harish Chandra Verma (born 3 April 1952) is an Indian experimental physicist and a retired professor at the Indian Institute of Technology Kanpur since 1994.
 His field of research is nuclear physics.
Robert Graham Hamish Robertson (born 3 October 1943 in Ottawa) is a Canadian experimental physicist.
 He is the "Boeing Distinguished Professor" for physics at the University of Washington and director of the University of Washington's Center for Experimental Nuclear Physics and Astrophysics.
 His specialty is neutrino physics.
Girsh Blumberg is an Estonian-American experimental physicist working in the field of experimental condensed matter physics, spectroscopy, nano-optics, and plasmonics.
 Blumberg is also a fellow at the American Physical Society and Professor of Physics at Rutgers University.
Duncan G. Steel (born 1951) is an American experimental physicist, researcher and professor in quantum optics in condensed matter physics.
 He is the Robert J. Hiller Professor of Electrical Engineering, Professor of Physics, Professor of Biophysics, and Research Professor in the Institute of Gerontology at the University of Michigan.
 Steel is also a Guggenheim Scholar and a Fellow of American Physical Society, the Optical Society of America, and the Institute of Electrical and Electronics Engineers.
 He coedited the five-volume series on the Encyclopedia of Modern Optics.
Concepts of Physics is a calculus-based physics textbook by H. C. Verma.
 The book was first published in 1992.
 It is published as a two-volume set, with each volume roughly covering the physics syllabus of class XI and class XII respectively.
 The book is extensively popular amongst students preparing for competitive exams, especially the Joint Entrance Examination.
Rappal Sangameswara Iyer Krishnan (23 September 1911 – 2 October 1999) was an Indian experimental physicist and scientist.
 He was the Head of the department of Physics at the Indian Institute of Science and the vice chancellor of the University of Kerala.
 He is known for his pioneering researches on colloid optics and a discovery which is now known as "Krishnan Effect".
 He was a Fellow of the Indian Academy of Sciences, Indian National Science Academy and the Institute of Physics, London and a recipient of the C. V. Raman Prize.
Wilhelm Hanle (13 January 1901 – 29 April 1993, Gießen) was a German experimental physicist.
 He is known for the Hanle effect.
 During World War II, he made contributions to the German nuclear energy project, also known as the Uranium Club.
 From 1941 until "emeritus" status in 1969, he was an ordinarius professor of experimental physics and held the chair of physics at the University of Giessen.
Johannes Wilhelm Heinrich Juilfs, also known by the alias Mathias Jules, (15 December 1911 – 1995) was a German theoretical and experimental physicist.
 He was a member of the "Sturmabteilung" (SA) and then, in 1933, of the "Schutzstaffel" (SS).
 Prior to World War II, he was one of three SS staff physicists who investigated the physicist Werner Heisenberg during the Heisenberg Affair, instigated, in part, by the ideological "deutsche Physik" (German physics) movement.
 During the war, he worked as a theoretical physics assistant at the Kaiser Wilhelm Institute for Physics.
 During the denazification process after World War II, he was banned from working as a civil servant in academia.
 For a few years, he worked as a school principal, and then he took a job as a physicist in the textile industry.
 With the help of Heisenberg and the Minister of Lower Saxony, he was able to become a full professor at the University of Hanover.
Chien-Shiung Wu (; May 31, 1912 – February 16, 1997) was a Chinese-American experimental physicist who made significant contributions in the field of nuclear physics.
 Wu worked on the Manhattan Project, where she helped develop the process for separating uranium metal into uranium-235 and uranium-238 isotopes by gaseous diffusion.
 She is best known for conducting the Wu experiment, which contradicted the hypothetical law of conservation of parity.
 This discovery resulted in her colleagues Tsung-Dao Lee and Chen-Ning Yang winning the 1957 Nobel Prize in physics, and also earned Wu the inaugural Wolf Prize in Physics a mere two decades later in 1978.
 Her expertise in experimental physics evoked comparisons to Marie Curie.
 Her nicknames include "the First Lady of Physics", "the Chinese Madame Curie", and the "Queen of Nuclear Research".