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Question 27 sir
27. Specific heat of water is 4.2 J/g 0C. If light of frequency 3*109 Hz is used to heat 400 g of water from 200C to 400C, find the no. of photons needed .
Answers (1)
@lakhan
Energy required to heat water=
Energy provided by photon=
now equate E1=E2
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