What is effective quiet? Continuous noise? Interrupted noise? Intermittent noise? Time-varying noise?
Noise that:
- is too soft to cause TS
- remains above EQ
- is on for long periods above EQ
- is broken up by short breaks of EQ
- stays above EQ but varies over time
What is impulse noise?
What is impact noise?
- Transient noise produced by the sudden release of energy and exceeds 140dBSPL
- Transient noise caused by impact between objects and is usually less than 140dBSPL
What is equivalent level?
Measurement taken when noise varies in duration and intensity during a period of time
The equivalent level for a 24 hour period is expressed as:
Leq(24)
Noise surveys collect a time-weighted average to identify which employees are exposed to greater than or equal to _ dBA TWA
85 dbA TWA
What is a sound level meter?
Measures the magnitude of sound in a single moment
What is a Dosimeter?
Device used to record the amount of sound exposure that accumulates over an entire work day
Recovery from noise exposure is expected to occur within _ hours after the noise ends
16 hours
Recovery can be delayed if the noise is intermittent, lasts longer than 8-12 hours, or if the temporary threshold shift is greater than _ dB
40 dB
The weakest SPLs that cause a temporary threshold shift are 75 to 80 dB for _ noise
Broadband noise
