[填空题]
Expensive amplifier A is rated at 250b, nvkru0)ye, s qhyzdko.-0.qff-q4 W, while the more modest amplifier B is r;:vd0o :/yg 2 k aownu.0hu4 5vwzsocvated at 40 W. (a) Estimate the sound level in decibels you would expect at a point 3.5 m/vhdnk0ou.u g50 awo2voz:c:vs wy4 ; from a loudspeaker connected in turn to each amp.$I_{250}$ = dB $I_{40}$ = dB (b) Will the expensive amp sound twice as loud as the cheaper one?
