ANSWER
20 W/m^2
EXPLANATION
The intensity of a wave at a surface is the average transferred energy per unit area by the wave through the surface:
[tex]I=\frac{P}{A}[/tex]In this problem, P = 1 W and A = 0.05m^2. Hence, the intensity at the speaker is:
[tex]I=\frac{1W}{0.05m^2}=\frac{1W}{\frac{1}{20}m^2}=20W/m^2[/tex]