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This is dual nature radiation of matter problem
Answer is 1st option.
Explain it.

raju nagula , 6 Years ago
Grade
anser 1 Answers
Mahima Kanawat

Last Activity: 6 Years ago

Dear student 
The number of photoelectrons emitted per second is inversely proportional to the square of distance. 
Let initial photoelectrons be n then
n / n' = (1/2)2/(1)2
n' = 4n
WITH REGARDS 
MAHIMA 
ASKIITIANS FORUM EXPERT 
 

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