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- Exponential and Logarithmic functions

Still Confused?

Try reviewing these fundamentals first

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Try reviewing these fundamentals first

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Get Started Now- Lesson: 12:51
- Lesson: 21:43

This time, we will bridge the gap between physics and mathematics by studying another application of logarithmic functions. We will learn about the dB Scale and explore how this logarithmic scale can be used to compare the loudness of sounds.

Basic Concepts: Exponents: Rational exponents

Related Concepts: Derivative of inverse trigonometric functions, Derivative of logarithmic functions

dB scale (loudness of sounds)

${{I_1}\over{I_2}} = 10 ^ {({{dB_1 - dB_2}\over10})}$

${{I_1}\over{I_2}} = 10 ^ {({{dB_1 - dB_2}\over10})}$

- 1.A piano playing (65dB) is __________ times as loud as a whisper (30dB).
- 2.A whisper (30dB) is __________ times as loud as a piano playing (65db).

6.

Exponential and Logarithmic functions

6.1

Converting from logarithmic form to exponential form

6.2

Evaluating logarithms without calculator

6.3

Common logarithms

6.4

Evaluating logarithms using change-of-base formula

6.5

Converting from exponential form to logarithmic form

6.6

Product rule of logarithms

6.7

Quotient rule of logarithms

6.8

Combining product rule and quotient rule in logarithms

6.9

Solving logarithmic equations

6.10

Evaluating logarithms using logarithm rules

6.11

Continuous growth and decay

6.12

Finance: Compound interest

6.13

Exponents: Product rule $(a^x)(a^y)=a^{(x+y)}$

6.14

Exponents: Division rule ${a^x \over a^y}=a^{(x-y)}$

6.15

Exponents: Power rule $(a^x)^y = a^{(x\cdot y)}$

6.16

Exponents: Negative exponents

6.17

Exponents: Zero exponent: $a^0 = 1$

6.18

Exponents: Rational exponents

6.19

Graphing exponential functions

6.20

Graphing transformations of exponential functions

6.21

Finding an exponential function given its graph

6.22

Logarithmic scale: Richter scale (earthquake)

6.23

Logarithmic scale: pH scale

6.24

Logarithmic scale: dB scale

6.25

Finance: Future value and present value

We have over 830 practice questions in Precalculus for you to master.

Get Started Now6.1

Converting from logarithmic form to exponential form

6.2

Evaluating logarithms without calculator

6.3

Common logarithms

6.4

Evaluating logarithms using change-of-base formula

6.5

Converting from exponential form to logarithmic form

6.6

Product rule of logarithms

6.11

Continuous growth and decay

6.12

Finance: Compound interest

6.13

Exponents: Product rule $(a^x)(a^y)=a^{(x+y)}$

6.14

Exponents: Division rule ${a^x \over a^y}=a^{(x-y)}$

6.15

Exponents: Power rule $(a^x)^y = a^{(x\cdot y)}$

6.16

Exponents: Negative exponents

6.18

Exponents: Rational exponents

6.22

Logarithmic scale: Richter scale (earthquake)

6.23

Logarithmic scale: pH scale

6.24

Logarithmic scale: dB scale

6.25

Finance: Future value and present value