Who was the first to observe radio waves?

• A. Christian Doppler
• B. Heinrich Hertz
• C. Albert Einstein
• D. James Clerk Maxwell

Answer: (B)

Heinrich Hertz is correctly identified as the first person to conclusively observe radio waves. In the late 1880s, Hertz conducted experiments that demonstrated the existence of electromagnetic waves, which were theorized by James Clerk Maxwell earlier. Hertz created devices that generated and detected these waves, confirming their properties and characteristics, which laid the groundwork for the development of radio technology.

While Maxwell's contributions to the theory of electromagnetic waves were pivotal, it was Hertz's experimental observations that proved the existence of radio waves. His work included generating radio waves in a laboratory and measuring their properties, effectively leading to practical applications of radio communications.