A tornado warning siren on top of a tall pole radiates sound waves uniformly in all directions. At a distance of 15.0 m the intensity of the sound is 0.250 W/m2. At what distance from the siren is the intensity of 0.010 W/m2 12:31 PM PDFGENPHYSICS-1-Q2W4.pdf 3/ 4If waves spread out equally in all directions from a source, the intensity at a distance r from the sourceis inversely proportional. Thus, it follows the inverse-square law of intensity asI2Exercises / ActivitiesActivity 1: Mechanical Waves and Wave IntensityWhat you need:Paper and penScientific CalculatorWhat to do 1: Answer the following questions based on the concepts that you have learned. Write youranswer in a separate sheet of paper.1. Is it possible to have a longitudinal wave on a stretched string? Why or why not?2. Is it possible to have a transverse wave on a steel rod? Why or why not?3. The wavelength and the period describe a wave. How are they related?If you double the wavelength of a wave on a particular string, what happens to the wave speed andthe frequency?4.What to do 2: Answer the following problems. Write your solutions in a separate sheet of paper.1. The speed of sound in air at 20°C is 344 m/s.What is the wavelength of a sound wave with a frequency of 784 Hz, corresponding tothe note on a piano, and how many seconds does each vibration take?b.а.What is the wavelength of a sound wave one octave higher (double the frequency)than the note in part a?You hold one end of the clothesline taut and wiggles it up and down sinusoidally with frequency2.00 Hz and amplitude 0.075 m. The wave speed on the clothesline is v = 12.0 m/s. At t = 0, the endhas maximum positive displacement and is instantaneously at rest. Assume that no wave bouncesback from the far end. Find the2.a. Angular frequencyb. period T,C.wave number k.3.A tornado warning siren on top of a tall pole radiates sound waves uniformly in all directions. At adistance of 15.0 m the intensity of the sound is 0.250 W/m2. At what distance from the siren is theintensity of 0.010 W/m²?ReflectionGive practical applications of the concepts that you have learned from the learning activities. Writeyour 5-sentence answer in a separate sheet of paper.RUBRICS1.Practical applicationis scientificallyexplained consistentto the concepts, andhas noNo discussion.Practical application isscientifically explainedPracticalapplication isexplainedconsistent to theconcepts, but withminimalconsistent to theconcepts but withmisconceptions.misconceptions.misconceptions.

Given as, Distance= 15.0 m, intensity of the sound= 0.250 W/m2.

Answered: d waves uniformly in all directions. At…

Math

Advanced Math

d waves uniformly in all directions. At a distance of 15.0 m the intensity of the sound is 0.250 W

Advanced Engineering Mathematics

10th Edition

ISBN:9780470458365

Author:Erwin Kreyszig

Publisher:Erwin Kreyszig

Chapter2: Second-order Linear Odes

Section: Chapter Questions

Problem 1RQ

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A tornado warning siren on top of a tall pole radiates sound waves uniformly in all directions. At a distance of 15.0 m the intensity of the sound is 0.250 W/m2. At what distance from the siren is the intensity of 0.010 W/m2

12:31 PM PDF
GENPHYSICS-1-Q2W4.pdf 3/ 4
If waves spread out equally in all directions from a source, the intensity at a distance r from the source
is inversely proportional. Thus, it follows the inverse-square law of intensity as
I2
Exercises / Activities
Activity 1: Mechanical Waves and Wave Intensity
What you need:
Paper and pen
Scientific Calculator
What to do 1: Answer the following questions based on the concepts that you have learned. Write your
answer in a separate sheet of paper.
1. Is it possible to have a longitudinal wave on a stretched string? Why or why not?
2. Is it possible to have a transverse wave on a steel rod? Why or why not?
3. The wavelength and the period describe a wave. How are they related?
If you double the wavelength of a wave on a particular string, what happens to the wave speed and
the frequency?
4.
What to do 2: Answer the following problems. Write your solutions in a separate sheet of paper.
1. The speed of sound in air at 20°C is 344 m/s.
What is the wavelength of a sound wave with a frequency of 784 Hz, corresponding to
the note on a piano, and how many seconds does each vibration take?
b.
а.
What is the wavelength of a sound wave one octave higher (double the frequency)
than the note in part a?
You hold one end of the clothesline taut and wiggles it up and down sinusoidally with frequency
2.00 Hz and amplitude 0.075 m. The wave speed on the clothesline is v = 12.0 m/s. At t = 0, the end
has maximum positive displacement and is instantaneously at rest. Assume that no wave bounces
back from the far end. Find the
2.
a. Angular frequency
b. period T,
C.
wave number k.
3.
A tornado warning siren on top of a tall pole radiates sound waves uniformly in all directions. At a
distance of 15.0 m the intensity of the sound is 0.250 W/m2. At what distance from the siren is the
intensity of 0.010 W/m²?
Reflection
Give practical applications of the concepts that you have learned from the learning activities. Write
your 5-sentence answer in a separate sheet of paper.
RUBRICS
1.
Practical application
is scientifically
explained consistent
to the concepts, and
has no
No discussion.
Practical application is
scientifically explained
Practical
application is
explained
consistent to the
concepts, but with
minimal
consistent to the
concepts but with
misconceptions.
misconceptions.
misconceptions.

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