Solving Intensity and Power Homework: 100 m, 126 mW

  • Thread starter Thread starter sonutulsiani
  • Start date Start date
  • Tags Tags
    Intensity Power
Click For Summary

Homework Help Overview

The problem involves a spherical sinusoidal source radiating sound uniformly, with a focus on calculating sound intensity at different distances and determining the power radiated by the source. The context includes specific intensity levels and multiple-choice answers for both questions.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • Participants discuss the calculations for intensity at a distance and the corresponding power output, with one participant expressing uncertainty about their answer for power. There is a question regarding the units used for power, specifically the confusion between watts and milliwatts.

Discussion Status

The discussion is ongoing, with participants clarifying the units of measurement and addressing doubts about the correctness of the answers provided. There is no explicit consensus on the second answer, but some guidance has been offered regarding unit interpretation.

Contextual Notes

Participants are navigating potential confusion between different units of power (watts vs. milliwatts) and the implications this has on their answers. The original poster's uncertainty about their second answer suggests a need for further clarification on unit conversions.

sonutulsiani
Messages
136
Reaction score
0

Homework Statement



A spherical sinusoidal source radiates sound uniformly in all directions. At a distance 10.0m the sound intensity level is 1.00 × 10−4 W/m2.

1. At what distance from the source is the intensity 1.00 × 10−6 W/m2?
A. 1 m
B. 10 m
C. 100 m
D. 1 km


2. What is the power radiated by this source?
A. Pav = 208 mW
B. Pav = 126 mW
C. Pav = 332 mW
D. Pav = 412 mW



Homework Equations





The Attempt at a Solution



I got 1 as 100 m and 2 as 126 watt, but I am not sure about the 2nd answer. So please help me. Thanks
 
Physics news on Phys.org
Both answers are correct. Why did you doubt your second answer?
 
I doubt the 2nd answer because I get 0.126 watt, but the answer is in megawatt
 
Did you get what i amsaying
 
The answers are in milliwatts, not megawatts.
 

Similar threads

Replies
5
Views
7K
Replies
6
Views
2K
  • · Replies 10 ·
Replies
10
Views
3K
  • · Replies 1 ·
Replies
1
Views
3K
  • · Replies 7 ·
Replies
7
Views
2K
Replies
2
Views
4K
  • · Replies 5 ·
Replies
5
Views
2K
Replies
4
Views
2K
  • · Replies 1 ·
Replies
1
Views
5K
Replies
4
Views
4K