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CGP EDU Academic Team
Published on: August 14, 2026
The latent heat of fusion of ice is 330 J/g. Calculate the number of photons of radiation of frequency 5 × 10 13 s –1 to cause the melting of 1 mole of ice. Take h = 6.6 × 10 –34 J.S. Express your answer as X × 10 22 , what is the value of 'X'.
Text Solution
Verified by ExpertsThe correct answer is:
CHECK THE SOLUTION.
Heat required for melting 1 mole (18 g) of ice = 330 × 18 = 5940 J
Energy of one photon = h ν = 6.6 × 10 –34 × 5 × 10 13 = 33 × 10 –21 J
∴ Total number of photons required = 
≈ 1.8 × 10 23
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