Question

A sound at 50 dB exerts a pressure that is _______ times greater than a sound at 30 dB.

A.10
B.100
C.1000
D.10,000

2. The colors of visible light each correspond to a different frequency of electromagnetic waves.

True
False

Answer 1

for number 2

violet: 668–789 THz
indigo: 668–714 THz
blue: 606–668 THz
green: 526–606 THz
yellow: 508–526 THz
orange: 484–508 THz
red: 400–484 THz

Answer 2

I think db are in log

I wanna say 100 but dont take me to serious in this one.

Answer 3

\[20=20\times \log_{10} \frac{P _{1}}{P _{2}}\]
\[\log_{10} \frac{P _{1}}{P _{2}}=1\]
\[\frac{P _{1}}{P _{2}}=10\]

Answer 4

thank you but i dont understand the answer to the first one

Answer 5

Im Sorry i mean the second one .,!

Answer 6

30db= 0.000632456
50db=0.006324555

10 is the correct answer.
http://www.sengpielaudio.com/calculator-soundlevel.htm

Answer 7

The dB is a logarithmic ratio. If the ratio of two sound pressure levels is 1000 to 1 then the ratio in dB is\[20\times \log_{10}\frac{1000}{1}=20\times 3=60dB\]

Answer 8

Brent0423 the dB is a ratio not a value. Please explain your numbers

Answer 9

those are the numbers for the pressure

Answer 10

The numbers must be relative to a reference sound pressure. This reference level should be stated.