20. Henri Becquerel expected to see only weak images on the photographic plate containing
the uranium salt because he thought
O fluorescent minerals needed direct sunlight to produce radio waves.
O fluorescent minerals needed direct sunlight to produce X-rays.
O fluorescent minerals needed direct sunlight to produce microwaves.
O fluorescent minerals needed direct sunlight to produce gamma rays.
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20. Henri Becquerel expected to see only weak images on the photographic plate containing
the urani...
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