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Lenard observed photoemission when he used radiation that was:

AUnderlying
BUltraviolet
CUltrasonic
DUnderwater
Answer & Solution
Correct answer: B. Ultraviolet
1. The radiation had to be energetic enough to free electrons. 2. Lenard observed the effect when ultraviolet radiations were used. 3. So the correct answer is ultraviolet. _Source: syllabus Physics Part II, Ch 11 'Dual Nature of Radiation and Matter'_
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