What did Wilhelm Conrad Roentgen discover?

X-Rays

The correct answer is Option (2) → X-Rays

Wilhelm Conrad Roentgen discovered X-rays in 1895. His discovery revolutionized the field of medicine and science by enabling the visualization of internal structures of the human body without the need for invasive procedures. X-rays have since become an indispensable tool in various fields, including medicine, industry, and security, for imaging and analysis purposes. Roentgen's discovery earned him the first Nobel Prize in Physics in 1901.