Question

Find the number of photons of radiation of frequency $5\times {10}^{13}{s}^{-1}$ that must be absorbed in order to melt one gm ice when the latent heat of fusion of ice is 331.5j/g.

• A. ${10}^{22}$
• B. ${10}^{28}$
• C. ${10}^{25}$
• D. ${10}^{35}$

Answer 1

Answer: (A)

Let n photon is required.

$E=nhv;n=\frac{331.5}{(6.6\times {10}^{-34}\times 5\times {10}^{13})}={10}^{22}$

Hence, the correct option is $A$