0
Time is usally expressed in hours, minutes, or seconds.
"Permitted Noise Exposure Time Guidelines - SPL"
Sound pressure level Lp and permissible exposure time t:
115 dB = 0.46875 minutes (~30 sec)
112 dB = 0.9375 minutes (~1 min)
109 dB = 1.875 minutes (< 2 min)
106 dB = 3.75 minutes (< 4 min)
103 dB = 7.5 minutes
100 dB = 15 minutes
97 dB = 30 minutes
94 dB = 1 hour
91 dB = 2 hours
88 dB = 4 hours
85 dB = 8 hours
82 dB = 16 hours
Lower dBs are said to be harmless
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What is another word for exposure time?
exposure time = induction period
Why cannot rates be expressed as a percentage?
Rates cannot be expressed as a percentage because rates are typically ratios that compare two different quantities, such as distance traveled per unit of time. Percentages, on the other hand, represent a proportion out of 100. While rates can be converted to percentages by multiplying by 100, they are fundamentally different concepts and are expressed in different ways to accurately convey the relationship between the two quantities being compared.
Assembly line a produces 45 units in the same time that it takes assembly line b to produce 37 units if during line b produced 555 units how many units did line a produce during the same time?
650
Which combination of units expresses density?
Which combination of units expresses density?
What is the elapsed time for 108 and 137?
It is 137 - 108 = 29 units of time.
