Final answer:
The limit of S(t) as t approaches 0 from the right in Weiss's law of excitation of tissue is infinity, indicating that as time decreases, the strength of the electric current required for excitation increases without bound.
Step-by-step explanation:
According to Weiss's law of excitation of tissue, the strength S of an electric current is related to the time t the current takes to excite tissue by the formula S(t) = a/t + b, where t is greater than 0, and a and b are positive constants.
To evaluate the limit as time t approaches 0 from the right, we get lim S(t) as t → 0⁺, which effectively means we are looking at the behavior of the strength of the electric current as the time taken to excite the tissue approaches an infinitesimally small value.
As t gets closer to 0, the term a/t becomes larger and larger since we are dividing a constant a by a smaller and smaller positive number. Thus, the limit of S(t) as t approaches 0 from the right is infinity.
This result suggests that as the time taken to excite the tissue is made shorter and shorter, the strength of the electric current gets stronger and stronger.
This is consistent with the physical understanding that a quick application of current will require a larger intensity to achieve the same level of excitation as a longer application with a weaker current.