Dr Menon has made notable contributions with regard to the nuclear emulsion technique, and the physics of elementary particles, particularly strange particles. He has conducted significant cosmic ray investigations in India at high altitudes and at great depths underground. Dr. Menon in collaboration with his colleagues, has demonstrated the existence of muons of varying energies, of monoenergetic high energy, pions and of electrons of varying energies, as secondaries in the decay of K-particles, thus establishing the Km3, KP2 and Ke3 decay modes.