Specific heat of water is 4.2 J/kg K. If light of frequency 4×109 Hz – InterviewSolution

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1.	Specific heat of water is 4.2 J/kg K. If light of frequency 4×109 Hz is used to heat 100 gm of water from 20 ∘C to 100 ∘C. The no. of photons required will be,
Answer» Specific heat of water is $4.2 J/kg K$ . If light of frequency $4 \times 10^{9} Hz$ is used to heat $100 gm$ of water from $20^{\circ} C$ to $100^{\circ} C$ . The no. of photons required will be,

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