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Archy [21]
3 years ago
6

Help with 4 and 5 and also the one below... I WILL GIVE BRAINLIEST TO THE CORRECT ANSWER!

Physics
2 answers:
Sophie [7]3 years ago
6 0

Answer: does anyone have the answers to the sound and hearing quiz unit 6 lesson 1 I need them ASAP

gizmo_the_mogwai [7]3 years ago
4 0

#1

as per the formula of level of sounds we know that

L = 10 Log\frac{I}{I_o}

now for two different levels we can use that

L_2 - L_1 = 10 Log\frac{I_2}{I_1}

now plug in data in above equation

50 - 20 = 10 Log \frac{I_2}{I_1}

10^3 = \frac{I_2}{I_1}

now we know that

\frac{I_2}{I_1} = \frac{r_1^2}{r_2^2}

10^3 = \frac{15^2}{r^2}

r = 47 cm

#4)

level of sound is given as 110 dB

now we can say

L = 10 Log\frac{I}{I_0}

110 = 10 Log\frac{I}{10^{-12}}

I = 0.10 W/m^2

now the energy received per second is given as

P = Intensity \times area

P = 0.10 \times \pi r^2

P = 0.10 \times \pi(0.003)^2

P = 2.8 \mu J

#5

length of the canal is 2.4 cm

resonating frequency of first harmonic is given as

f = \frac{v}{4L}

f = \frac{340}{4\times 0.024}

f = 3.6 kHz

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