Physics - Heat & Thermo Question with Solution | TestHub

An electron beam of speed $2\times 10^7\mathrm{m}/\mathrm{s}$ and current 0.030 A is absorbed by a 0.4 g target of specific heat 100 cal/(kg °C). Take $e=1.602\times 10^{-19}\mathrm{C},m_e=9.109\times 10^{-31}\mathrm{kg}$ and $\mathrm{J}=4.2$. Find the rate of temperature rise in °C/s.