Final answer:
The referenced noise ordinance question involves permissible nighttime sound levels inside a residence, measured in decibels (dB). It entails choosing a scenario which complies with professional recommendations of not exceeding 85 dB for 8-hour exposures without hearing protection. Correct selection addresses the potential for community disturbance or hearing damage at higher sound levels.Option 4 (10PM, 9AM,90) is the correct answer.
Step-by-step explanation:
The noise ordinance question relates to sound levels measured in decibels (dB). It asks for the permissible sound level during certain nighttime hours that can be heard inside another person's residence with doors and windows closed. The answer should consider professional recommendations on safe exposure levels to noise. The standard accepted by several government agencies and health-related professional associations is that noise levels should not exceed 85 dB for 8-hour daily exposures without hearing protection. Since typical bedroom levels should be much quieter to prevent sleep disturbance, the correct noise ordinance levels would likely be significantly lower than 85 dB.
A sound level in excess of this could potentially lead to hearing damage or disturbance, especially over an extended period of time. It is important to note that a 10 dB increase represents a doubling in loudness; therefore, a sound level difference of 30 dB is significant, indicating the sound intensity is 1,000 times greater. This understanding has real-world applications, such as assessing the impact of new transportation services on a community. For example, if a train service is proposed that will increase downtown sound levels by 30 dB and the current level is 70 dB, this increase would be very noticeable and possibly harmful, reaching a level of 100 dB. Hence, such an increase would definitely be a cause for concern for the townspeople.