Whose experiments on the quasi-optical properties of very short radio waves led him to make improvements on the coherer, an early form of radio detector?
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → Jagadish Chandra Bose
Jagadish Chandra Bose worked at Presidency College, Calcutta, in the 1890s on millimetre-wave (microwave) radio, showing that these very short waves are reflected, refracted and polarised like light. For this he built an improved coherer, a detector of radio waves; his galena-crystal detector was one of the first semiconductor devices. He is also known for his later work on the response of plants, measured with his crescograph.