Question

suppose that you would like to have a siren which is loud enough that its intensity will exceed that of typical street traffic (which has a sound level of ) by at least a factor of three for cars that are away from the siren source. however, you also do not want it to be so loud that it can cause hearing damage (caused by a sound level above ) for a bystander at a distance of from the siren source. what is the range that the power of the siren can take so that it is consistent with these requirements? (you may neglect damping/attenuation). maximum power: 3973 correct minimum power: 1072 correct (b) suppose that you perceive a sound level equal to when you are situated from an ambulance siren. annoyed by the sound of the siren, you start to walk in the opposite direction. how much further do you need to walk in order for the sound level to drop to ? 75 correct (c) suppose an ambulance produces a sound level of at a distance of . how many ambulances would need to be at the same position in order for the sound level at this distance () to exceed the threshold for hearing damage ()

Answer 1

The queries covered are about the calculation of power input for a speaker to achieve a certain sound intensity level, the combined effect of multiple sound sources on the overall intensity level, and the relation between sound intensity level and amplitude of sound waves, as well as the implications of hearing loss in terms of decibels.

Step-by-step explanation:

The question relates to sound intensity levels and the calculation of various parameters in context of acoustics, a branch of physics. Regarding the power input needed to produce a 90.0-dB sound intensity level for a speaker, we use the efficiency of the speaker to determine the actual power required. For interference effects in a group of sound sources, like the boom box competition or the houseflies, we can apply the principle of superposition to calculate the combined sound intensity level assuming additive sound intensities in the absence of destructive interference.

The amplitude change in a sound wave when the sound intensity level is increased by 40.0 dB can be found using the relationship between intensity and pressure amplitude. Lastly, in terms of hearing acuity and sound amplification, we typically use decibels (dB) to quantify the increase in sound intensity required for a person with hearing loss to perceive sound as normal.