What type of noise is defined as lasting longer than 1 second and is hazardous at 85 dB or greater?

The correct choice is steady noise, which is defined as continuous sound that remains relatively constant over time. Steady noise lasting longer than 1 second can be hazardous when it reaches levels of 85 dB or higher. This is critical since prolonged exposure to such noise levels can lead to hearing damage or loss.

Understanding this concept is essential within audiology, as it helps professionals assess the risk associated with noise exposure in various environments. It is common for steady noise to be encountered in workplaces like factories or construction sites where machinery operates consistently at high decibel levels.

Other types of noise, such as pulsating, transient, and variable noise, may not have the same consistent intensity or duration, resulting in different implications for hearing safety and health. Pulsating noise might fluctuate between loud and quiet, transient noise consists of brief sounds, and variable noise changes over time but does not maintain a constant level, which means their hazardous nature can differ from steady noise. Such distinctions are vital for effectively managing and mitigating risks related to noise exposure in audiology practice.