(b) $\frac{E_{1}}{E_{2}} = \left( \frac{T_{1}}{T_{2}} \right)^{4} = \left( \frac{727 + 273}{127 + 273} \right)^{4} = \frac{(1000)^{4}}{(400)^{4}} = \frac{10^{4}}{4^{4}} = \frac{625}{16}$
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.