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We present a derivation of Hawking radiation through tunneling mechanism fora general class of asymptotically flat, spherically symmetric spacetimes. Thetunneling rate $\Gamma \sim \exp{(\Delta S)}$ arises as a consequence of thefirst law of thermodynamics, TdS=dE + PdV. Therefore, this approachdemonstrates how tunneling is intimately connected with the first law ofthermodynamics through the principle of conservation of energy. The analysis isalso generally applicable to any reasonable theory of gravity so long as thefirst law of thermodynamics for horizons holds in the form, TdS=dE + PdV.

Hawking radiation as tunneling for spherically symmetric black holes: A generalized treatment