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
exposure time = induction period
It depends on the context. If the two quantities being compared (numerator and denominator) are of the same kind then the rate CAN be expressed as a percentage. For example, both are money and the rate of interest is usually expressed as a percentage. However, the word "rate" is often used for comparisons over time. For example, speed is the rate of change of location (or distance) over time. Here the two measures - distance and time - are different and so the answer cannot be expressed as a percentage.
650
Which combination of units expresses density?
It is 137 - 108 = 29 units of 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 =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.
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.
Automatic exposure time electronic exposure time mechanical exposure time
the time sequence if exposure ad disease is usually not known
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.
Velocity is defined as change in positin per time. It is usually expressed in m/s , Km/s . miles per second etc.,
exposure time = induction period
"Geologic time scales" usually refers to periods of millions, or even billions, of years.
Volume is the amount of space occupied by an object or substance, usually measured in cubic units such as liters or cubic meters. Rate refers to the speed or frequency at which something happens or is done, often expressed as a ratio or percentage over a specific unit of time.
(any unit of length) / (any unit of time) is a unit that can be used for the magnitude (size) of velocity, and must always be accompanied by a description of direction. Without it, all you have is a speed, not a velocity.
Relative age refers to the age of an object or event in comparison to another, using principles such as superposition and cross-cutting relationships. Absolute age, on the other hand, refers to the specific age of an object or event in years, usually determined through radiometric dating methods.