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OpenStudy (anonymous):

henri becquerel expected to see only weak images on the photographic plate containing the uranium salt because he thought fluorescent minerals needed direct sunlight to produce a. radio waves b.x-rays c. microwaves d.gamma rays

OpenStudy (anonymous):

Where's the question?

OpenStudy (wolfe8):

Welcome to OpenStudy. http://en.wikipedia.org/wiki/Henri_Becquerel Since it says radioactivity along with Marie, I'd say X-ray.

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