Which of the following events occurred first ? A. Albert Einstein propounded the General Theory of Relativity B. Max Planck unveiled the Quantum Theory C. Marconi first tranmitted a wireless signal D. Madame Marie Curie became the first woman Nobel Prize winner

The correct answer is: C. Marconi first transmitted a wireless signal.

• Albert Einstein propounded the General Theory of Relativity in 1915.
• Max Planck unveiled the Quantum Theory in 1900.
• Madame Marie Curie became the first woman Nobel Prize winner in 1903.
• Marconi first transmitted a wireless signal in 1896.

Hence, the event that occurred first is Marconi first transmitted a wireless signal in 1896.

Explanation:

• Albert Einstein propounded the General Theory of Relativity in 1915. The theory is a generalization of special relativity and Newton’s law of universal gravitation, providing a unified description of gravity as a geometric property of space and time, or spacetime.
• Max Planck unveiled the Quantum Theory in 1900. The theory is a fundamental theory in physics that provides a description of the physical properties of nature at the scale of atoms and subatomic particles.
• Madame Marie Curie became the first woman Nobel Prize winner in 1903. She was awarded the Nobel Prize in Physics along with her husband Pierre Curie and Henri Becquerel for their discovery of radioactivity.
• Marconi first transmitted a wireless signal in 1896. He transmitted a wireless signal across the Bristol Channel, a distance of about 1.5 miles.