MHT CET 2025 Physics question
When a big drop of water is formed form 'n' small drops of water, the energy loss is '3E' where 'E' is the energy of the bigger drop. The radius of the bigger drop is 'R' and that of smaller drop is 'r' then the value of 'n' is
Answer: (B)
Solution
The energy of a drop is its surface energy, so the bigger drop has . When small drops of radius coalesce into one big drop, the surface area decreases and the energy released is . This loss is given as , so
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