Photons absorbed in matter are converted to heat. A source emitting n photon/sec of frequency \(\nu\) is used to convert 1 Kg of ice at 0°C. Then, the time T taken for the conversion :
Answer & explanation
Correct answer: option 4
Energy spent to convert ice into water = m L = (1000 g) x (80 cal/g) = 80000 cal
Energy of photons used = n T x E = n T x h \(\nu\)
n T h \(\nu\) = m L or T = m L /nh \(\nu\)