# Question: A 1000 Hz tone from a loudspeaker has an intensity level

A 1000-Hz tone from a loudspeaker has an intensity level of 100 dB at a distance of 2.5 m. If the speaker is assumed to be a point source, how far from the speaker will the sound have intensity levels

(a) Of 60 dB and

(b) Barely high enough to be heard?

(a) Of 60 dB and

(b) Barely high enough to be heard?

## Answer to relevant Questions

During practice in a huddle, a quarterback shouts the play in anticipation of crowd noise during the actual game. To a receiver 0.750 m away from the quarterback in the huddle, it seems as loud as the noise from a screaming ...The wave speed in a liquid is given by v = √B/p, where B is the bulk modulus of the liquid and is its density. Show that this equation is dimensionally correct. What about v = √Y/pfor a solid? (Y is Young’s modulus.) A jet flies at a speed of Mach 2.0. What is the half-angle of the conical shock wave formed by the aircraft? Can you tell the speed of the shock wave? The first three natural frequencies of an organ pipe are 126 Hz, 378 Hz, and 630 Hz. (a) Is the pipe an open or a closed pipe? (b) Taking the speed of sound in air to be 340 m/s, find the length of the pipe. When all of its holes are closed, a flute is essentially a tube that is open at both ends, with the length measured from the mouthpiece to the far end (as in Fig. 14.16b). If a hole is open, then the length of the tube is ...Post your question