Exp&logFormulas

Exp&logFormulas - acidic and more than 7(7-14 is...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
Formulas for Applied Problems with Exponential or Logarithmic Formulas Radioactive Decay Formula : / 0 0 2 or 2 t t h h A A A A - - = = where A is the final amount, 0 A is the initial amount present at time 0, t is the time, and h is the half-life of the material. Population Growth: kt e P P 0 = where P is the current population, 0 P is the initial population at time 0, t is time in years, and k is the growth rate. Light Intensity: 0 x I I k = where I is the intensity of light (in lumens) at a distance of x meters below the surface of water and 0 I is the intensity of light above the water and k is a constant that depends on the clarity of the water. pH formula: ] log[ 3 + - = O H pH where pH is the number representing the acidity or alkalinity of a solution and ] [ 3 + O H is the hydronium ion concentration in moles per liter. (A pH of 7 is neutral, less than 7 (0-7) is acidic with the smaller the number the more
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: acidic, and more than 7 (7-14) is alkaline with the greater the number the more alkaline.) Richter Scale : = P A R log where R is the Richter scale measurement, A is the amplitude measured in micrometers, and P is the period or the time of one oscillation in seconds on the surface of the earth. Decibel Voltage Gain: 20log o I E db E = where db is the decibel voltage gain, E is the output voltage of a device and I E is the input voltage. Decibel Level of Sound: 10log I D I = where D is the decibel level, I is the intensity level, and I is the threshold sound intensity (a very faint sound). Population Doubling Time: ln 2 t r = where t is the time for a population to double and r is the growth rate as a decimal....
View Full Document

{[ snackBarMessage ]}

Ask a homework question - tutors are online