Respuesta :
A- There was no apparent source for the uranium salts' energy (just took the edg test)
Answer:
The correct answer is "There was no apparent source for the uranium salts’ energy."
Explanation:
Becquerel while working on X-rays accidentally discovered radioactivity. While working with uranium salts he observed that it emitted penetrating radiation that exposed photographic film. His contemporaries did not know radioactivity and hence they believed that there was no apparent source for the uranium salts’ energy.