Becquerel: Antoine Henri

: Days later, he developed the plate and found a clear, dark image of the crystals—meaning they were emitting "penetrating rays" spontaneously, without any external energy source like the sun.

: In 1899, he demonstrated that some radioactive rays (beta particles) could be deflected by magnetic fields, proving they were charged particles rather than waves. antoine henri becquerel

Becquerel's most famous achievement was an accidental discovery involving uranium salts. : Days later, he developed the plate and

: He was the first to realize that beta particles were identical to the high-speed electrons recently discovered by J.J. Thomson. : Days later

: Inspired by the discovery of X-rays, Becquerel wanted to see if phosphorescent materials emitted X-rays after being exposed to sunlight.

Beyond the initial discovery, Becquerel’s research advanced the field in several ways: