Two electric lamps A and B radiate the same power. Their filaments have the same diemensions, and have emissivities. `e_(A)` and `e_(B)`. Their surface tempratures are `T_(A)` an `T_(B)`. The ratio `T_(A)//T_(B)` will be equal to
A. `((e_(B))/(e_(A)))^(1//4)`
B. `((e_(B))/(e_(A)))^(1//2)`
C. `((e_(A))/(e_(B)))^(1//2)`
D. `((e_(A))/(e_(B)))^(1//4)`
