Suppose an explosion can just be heard over normal conversation with an intensity of $1.0\times {10}^{-6}\text{}{\text{\hspace{0.17em}W/m}}^2$ from 10km away. At what distance from the explosion will the sound have an intensity that causes pain ($10\text{}{\text{\hspace{0.17em}W/m}}^2$)? Note that this calculation ignores absorption of sound energy by air and objects.

(II) Expensive amplifier A is rated at 280 W, while the more modest amplifier B is rated at 45 W.

(b) What output wattage amp would sound about twice as loud as the 45-W amp?

(II) Your ears can accommodate a huge range of sound levels. What is the ratio of highest to lowest intensity at (a) 100 Hz, (b) 5000 Hz? (See Fig. 16–6.)

A source emits a sound in the shape of a cone, as shown in the figure below. If you measure the intensity to be 100 W/m² at a distance of 0.5 m, what is the power of the source?

A source emits sound spherically with a power of 2.2 × 10⁴ W. What is the minimum distance away from this sound that would be considered safe (a volume of 150 dB or less)?

A sound wave from a police siren has an intensity of 0.01 W/m² at a certain distance. A second sound wave from an ambulance has a sound intensity level 8 dB greater than the police siren, when measured at the same distance. What is the sound intensity level (in dB) of the sound wave due to the ambulance?