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he noticed the first effects of radioactivity while he observed that with exposure to the sunlight the mineral gave off a penetrating energy that could expose film.
The question is incomplete. No options (for which of the following) are given to answer the question.
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Radioactivity was discovered during 1896 by Henri Becquerel, who was a French scientist when he was working on phosphorescent materials. Other research was done by Becquerel, Ernest Rutherford, Paul Villard, Pierre Curie, Marie Curie, and others afterwards.
Irregularities in Uranus's orbit.
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Malthus observed that while populations tend to increase exponentially, food production can only grow linearly. This led him to theorize that in the long run, population growth would outstrip the ability to produce enough resources, leading to food shortages and poverty.
The Scientific Method: observation, hypothesis, experiment, verification, peer review.
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<Novanet> observation, inference!
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This is caused by refraction. A variation in air density corresponds to variation in refractive index of the air, locally near the road.