InterviewSolution
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InterviewSolution
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Photons absorbed in matter are converted to heat. A source emitting n photons/ sec of frequency `nu` is used to convert 1kg of ice at `0^(@)C` to water at `0^(@)C`. Then, the time T taken for the conversionA. decreases with increasing n, with v fixed.B. decreases with n fixed, v increasing.C. remains constant with n and v changing such that nv=constant.D. All of these. |
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Answer» Correct Answer - D (d) : Energy spent to convert ice into water `=mL=(1000g)xx80calg^(-1)=80000cal` Energy of photons used `=nTxxE=nTxxhv` `:.nThv=mL or T=(mL)/(mhv)` `:.Tprop1//n"when v is constant",Tprop1//v"when n fixed",Tprop1//nv."Thus T is constant if is constant. Thus options (a), (b) and (c) are correct"`. |
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