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According to Becquerel, what created the image on photographic film when it was placed in a drawer with uranium salt crystals?

The crystals emitted something that affected the film the same way light did.

The film caused a chemical change in the crystals.

The film exposed spontaneously, even when it was not exposed to light.

The uranium spontaneously emitted radioactive particles that exposed the film.

Verified Answer :

the second choice

"the film caused a chemical change in the crystals"

Answer;

The crystals emitted something that affected the film the same way light did.

Explanation;

  • Becquerel discovered the spontaneous emission of radiation from an element which he called radioactivity.
  • He placed uranium salts on top of an unexposed photographic plate which was wrapped in a desk drawer and when the plate was developed, there was an intense silhouette on the film.
  • He discovered that a piece of mineral which contained uranium could produce it's image on a photographic plate in the absence of light.

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