Correct Answer: (c) White LED
Solution:Three Japanese-born researchers 'Isamu Akasaki, Hiroshi Amano and Shuji Nakamura' on 7th October 2014, won the 2014 Nobel Prize for Physics. They were honoured for inventing efficient blue Light-Emitting Diodes (LED) lamps that worked as a bright and energy-saving white light sources. The Nobel Prize in Physics 2023 was awarded jointly to Pierre Agostini, Ferenc Krausz and Anne L' Huillier.