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Question
What happened when certain metals were irradiated with ultraviolet light, as found in 1887?
Options
They emitted low-speed, negatively charged particles.
They generated and detected electromagnetic waves.
They emitted fast-moving positively charged particles.
They produced a yellowish-green glow in soda glass.
MCQ
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Solution
In 1887, it was found that certain metals emitted low-speed, negatively charged particles when irradiated with ultraviolet light.
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