Question

At a rock concert, a dB meter registered 130 dB when placed 2.8 m in front of a loudspeaker on the stage. The intensity of the reference level required to determine the sound level is 1.0×10^-12 W/m^2. PART A) What was the power output of the speaker, assuming uniform spherical spreading of the sound and neglecting absorption in the air? Express your answer to two significant figures and include the appropriate units. PART B) How far away would the sound level be 83 dB? Express your answer to two significant figures and include the appropriate units.

          At a rock concert, a dB meter registered 130 dB when placed 2.8 m in front of a loudspeaker on the stage. The intensity of the reference level required to determine the sound level is 1.0×10^-12 W/m^2.

PART A)
What was the power output of the speaker, assuming uniform spherical spreading of the sound and neglecting absorption in the air?
Express your answer to two significant figures and include the appropriate units.

PART B)
How far away would the sound level be 83 dB?
Express your answer to two significant figures and include the appropriate units.

Show more…

Added by Scott R.

University Physics with Modern Physics

Hugh D. Young 14th Edition

Instant Answer

Solved by Expert Monisha Shukla

06/22/2022

Step 1

Given: Intensity level (β) = 130 dB Intensity of the reference level (I₀) = 1.0×10^-12 W/m^2 Distance from the speaker (r) = 2.8 m Using the formula for intensity level in decibels: β = 10 * log₁₀(I/I₀) Substitute the given values and solve for I: 130 = 10 * Show more…

Show all steps

lock

Thanks for your feedback!

At a rock concert, a dB meter registered 130 dB when placed 2.8 m in front of a loudspeaker on the stage. The intensity of the reference level required to determine the sound level is 1.0×10^-12 W/m^2. PART A) What was the power output of the speaker, assuming uniform spherical spreading of the sound and neglecting absorption in the air? Express your answer to two significant figures and include the appropriate units. PART B) How far away would the sound level be 83 dB? Express your answer to two significant figures and include the appropriate units.

Play audio

Feedback

Powered by NumerAI

Monisha Shukla and 92 other subject Physics 101 Mechanics educators are ready to help you.

Ask a new question

Labs

Want to see this concept in action?

NEW

Explore this concept interactively to see how it behaves as you change inputs.

View Labs

Key Concepts

Recommended Videos

Recommended Textbooks

Transcript

Ace is your personal tutor. It breaks down any question with clear steps so you can learn.

Start Using Ace

Continue solving this problem

Create a free account to:

View full step-by-step solution
Ask follow-up questions with Ace AI
Save progress and study later