Answer:
The sound level of 41 singers is approximately 79.52 dB.
Explanation:
As the sound level is given as 63.4 dB
The Intensity to Sound level relation is given as
![\beta=10 log \dfrac{I}{I_o}\\](https://tex.z-dn.net/?f=%5Cbeta%3D10%20log%20%5Cdfrac%7BI%7D%7BI_o%7D%5C%5C)
Here β is given as 63.4 dB
I is to be calculated for 1 singer
I_o is constant as 10⁻¹²
So the equation is given as
![\beta=10 log \dfrac{I}{I_o}\\I=10^{\beta/10}I_o\\I=10^{63.4/10}10^{-12}\\I=2.19 \times 10^{-4}](https://tex.z-dn.net/?f=%5Cbeta%3D10%20log%20%5Cdfrac%7BI%7D%7BI_o%7D%5C%5CI%3D10%5E%7B%5Cbeta%2F10%7DI_o%5C%5CI%3D10%5E%7B63.4%2F10%7D10%5E%7B-12%7D%5C%5CI%3D2.19%20%5Ctimes%2010%5E%7B-4%7D)
Now as there are 41 singers so their I is given as
![I_4_1=41*2.19 \times 10^{-4}\\I_4_1=0.0089](https://tex.z-dn.net/?f=I_4_1%3D41%2A2.19%20%5Ctimes%2010%5E%7B-4%7D%5C%5CI_4_1%3D0.0089)
Now the value of sound level is given as
![\beta_4_1=10 log \dfrac{I_4_1}{I_o}\\\beta_4_1=10 log \dfrac{0.0089}{10^{-12}}\\\beta_4_1=79.52 dB](https://tex.z-dn.net/?f=%5Cbeta_4_1%3D10%20log%20%5Cdfrac%7BI_4_1%7D%7BI_o%7D%5C%5C%5Cbeta_4_1%3D10%20log%20%5Cdfrac%7B0.0089%7D%7B10%5E%7B-12%7D%7D%5C%5C%5Cbeta_4_1%3D79.52%20dB)
The animator, Windsor McCay use "heavy lines" to define a character from all other drawing pieces whether it was background or other characters. (he just outlined his stuff with a thick, black pen)