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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.
Why is light measured in distance and not in time?
-- The distance that light travels in some amount of time is expressed in units of distance. -- The time that it takes light to cover some amount of distance is expressed in units of time. -- The speed of light is expressed in units of speed . . . distance/time
Speed is expressed in units of what?
speed =distance/time and units of speed can differ depending on the circumstance. in science we usually measure speed as meters per second (m/s) can also be written ms^-1.
How is bacteria growth expressed?
Bacteria growth is commonly expressed as the increase in the number of bacteria present over time. This can be quantified by measuring the colony-forming units (CFU) or by using optical density measurements to estimate bacterial density. Growth can also be expressed as generation time, which is the time it takes for a bacterial population to double in number.
Why is heart beat consider a rate?
The number of heartbeats per unit of time,usually expressed as beats per minute. The number of heartbeats per unit of time,usually expressed as beats per minute.
What units is velocity expressed in?
Velocity is typically expressed in units of distance per unit time, such as meters per second (m/s) or kilometers per hour (km/h).
What Types of termination of exposure to X-ray?
Automatic exposure time electronic exposure time mechanical exposure time
What are the units of the quenching constant in the context of fluorescence quenching?
The units of the quenching constant in the context of fluorescence quenching are typically expressed as reciprocal concentration per unit time, such as M-1s-1.
What is a disadvantage of cross sectional study?
the time sequence if exposure ad disease is usually not known
What are all SI units expressed of?
The basic units of the SI system are• metre : length• kilogram : mass• second : time• ampere : electric current• kelvin : thermodynamic temperature• mole : amount of substance• candela : luminous intensity.Other units are derived from these.
What are the units for the rate constant (kc) in a chemical reaction?
The units for the rate constant (k) in a chemical reaction depend on the overall order of the reaction. For a first-order reaction, the units are 1/time (usually s-1). For a second-order reaction, the units are 1/(concentration time) (usually M-1 s-1).
What are the units of measurement for the rate constant in a chemical reaction?
The units of measurement for the rate constant in a chemical reaction depend on the overall order of the reaction. For a first-order reaction, the units are 1/time (usually s-1). For a second-order reaction, the units are 1/(concentration x time) (usually M-1 s-1).
Velocity may be expressed in what?
Velocity is defined as change in positin per time. It is usually expressed in m/s , Km/s . miles per second etc.,
