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Hallwachs and Lenard investigated photoelectric emission during:
A1886 to 1902
B1786 to 1802
C1986 to 2002
D1686 to 1702
Answer & Solution
Correct answer: A. 1886 to 1902
1. Their work followed shortly after Hertz's discovery.
2. Wilhelm Hallwachs and Philipp Lenard investigated it in detail during 1886 to 1902.
3. So the correct answer is 1886 to 1902.
_Source: NCERT Class 12 Physics Part II, Ch 11 'Dual Nature of Radiation and Matter'_
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