The "After Glow" from Some Clock Faces Is Caused by Atoms

question 90

Multiple Choice

The "after glow" from some clock faces is caused by atoms

• A)being excited,
• B)vibrating at frequencies greater than a million billion times per second,
• C)remaining for some time in a state of excitation before de-exciting,
• And materials exhibiting this property are called
• D)fluorescent.
• E)phosphorescent.
• F)incandescent.
• G)luminescent.

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