# Logs and Decibels Flashcards

1

Q

log 100 = ?

A

2

2

Q

What exactly is a log?

A

An exponent value

3

Q

log 1,000 = ?

A

3

4

Q

log 10,000 = ?

A

4

5

Q

lob 1/ 100 = ?

A

-2

6

Q

log 100,000,000 = ?

A

8

7

Q

lob 1 / 1000 = ?

A

-3

8

Q

log 1 = ?

A

0

9

Q

log 2 = ?

A

0.3

10

Q

log 4 = ?

A

log 4 = log 2 + log 2

= 0.3 + 0.3

= 0.6

11

Q

log 20 = ?

A

log (2 x 10)

= log 2 + log 10

= 0.3 + 1 = 1.3

12

Q

log 400 + ?

A

log (4 x 100)

= log 4 + log 100

= 0.6 + 2

= 2.6

13

Q

What does a dB measure?

A

the change from initial strength to final strength for Amplitude, Intensity, and Power

14

Q

State the dB formula for Intensity.

A

dB = 10 x log ( Final Intensity / Initial Intensity )

15

Q

State the dB formula for Amplitude.,

A

dB = 20 x log ( Final Amplitude / Initial Amplitude )