Which best describes the results of Becquerel’s experiments?

When placed in sunlight, the uranium did not form an image and when placed in darkness, the uranium did form an image.
When placed in sunlight, the uranium did form an image and when placed in darkness, the uranium did not form an image.
Both formed images when placed in their respective places.
Neither formed images when placed in their respective places.

Question

Which best describes the results of Becquerel’s experiments? 


When placed in sunlight, the uranium did not form an image and when placed in darkness, the uranium did form an image.
When placed in sunlight, the uranium did form an image and when placed in darkness, the uranium did not form an image. 
Both formed images when placed in their respective places. 
Neither formed images when placed in their respective places.

ciarán95 · Answer

Hi @musarevusb ..... welcome to OpenStudy!! From what I remember, Becquerel proved from his experiments that uranium formed images in both darkness and sunlight. In sunlight, this was due to the phenomenon of flourescence, where an electron is able to absorb energy from the sun in the form of photons of light. In darkness, however, he discovered an image was formed due to the radioactivity of uranium, with its ability to spontaneously decompose and release particles. http://ansnuclearcafe.org/2011/12/13/henri-becquerels-discovery-of-radioactivity/#sthash.4Trio8xB.dpbs