Sound intensity levels lab report

OBJECTIVE

The purpose of this experiment is to:

  1. 1) measure sound intensity levels (SIL) in decibels (dB) and verify that an increase in SIL, eg. when
    two sources are played simultaneously, are a result of adding individual intensities (in W/m2),
    and not by adding the SILs directly.
  2. 2) establish a relationship between SIL (dB) and distance (m).

METHOD

Two sound sources of the same frequency are played individually, and then simultaneously, while the
SIL (dB) are measured using calibrated sound level meters (SLMs) tuned to the A-weighting setting. The
A-weighting setting sets a filter on the SLMs to make them mimic the characteristics of the human ear.

Data is gathered on a table, suggested by Table 1 below.

Table 1: Suggested table for gathering the data

ANALYSIS

  1. 1) Generate a new table, converting all the SIL (dB) from Table 1 to intensity (W/m2), and call this
    Table 2 from this point forward. A suggested format for Table 2 is shown below.
  2. 2) Add the intensities for source A and for source B along the same locations, and put the values on
    an additional column on Table 2. This will be the theoretical (or accepted value) for calculating
    the error in this experiment.
  3. 3) Calculate the error in your experimental value for intensity IA+B (dB), using IA + IB (dB) as the
    accepted value, and record them on the last column of Table 2.
    Table 2: Suggested table for Analysis
  4. 4) Plot a graph of SIL (dB) vs. distance (m) for source A, and another one for source B. (You may
    have a hard time drawing both on the same axes, so it’s okay to have 2 separate graphs). Try to
    draw a smooth curve joining the points on both graphs.
  5. 5) What is the trend that is seen in both graphs as distance from the source increases?

Location #

rA (m)

rB (m)

SILA (dB)

SILB (dB)

SILA+B (dB)

Location #

IA (W/m2)

IB (W/m2)

IA+B (W/m2)

IA + IB (W/m2)

Error (%)

2

  1. 6) Theoretically, what happens to the intensity (W/m2) of a sound when the distance is doubled?
  2. 7) Theoretically, what happens to the SIL (dB) of a sound when the distance is doubled?
  3. 8) a) From your first graph of SIL (dB) vs distance (m) for source A, calculate the change in the SIL
    (dB) for source A as the distance doubles from r = 2 m to r = 4 m.
    b) From your second graph of SIL (dB) vs distance (m) for source B, calculate the change in the
    SIL (dB) for source B as the distance doubles from r = 3 m to r = 6 m. You will have to estimate
    the values of the SIL (dB) at r = 3 m and r = 6 m from the graph after you have drawn a smooth
    curve joining the points.
  4. 9) Do these estimates of the change in SIL (dB) values match with the theoretical predictions
    drawn in Q #7 above?
  5. 10) Suggest the sources of error in this experiment (do not write “human error”!), any precautions
    that can be taken, and any improvements that can be made to reduce the errors while taking the
    measurements.

table has been completed for the sound intensity levels, i will attach, please graph the points.

Place your order
(550 words)

Approximate price: $22

Calculate the price of your order

550 words
We'll send you the first draft for approval by September 11, 2018 at 10:52 AM
Total price:
$26
The price is based on these factors:
Academic level
Number of pages
Urgency
Basic features
  • Free title page and bibliography
  • Unlimited revisions
  • Plagiarism-free guarantee
  • Money-back guarantee
  • 24/7 support
On-demand options
  • Writer’s samples
  • Part-by-part delivery
  • Overnight delivery
  • Copies of used sources
  • Expert Proofreading
Paper format
  • 275 words per page
  • 12 pt Arial/Times New Roman
  • Double line spacing
  • Any citation style (APA, MLA, Chicago/Turabian, Harvard)

Our guarantees

Delivering a high-quality product at a reasonable price is not enough anymore.
That’s why we have developed 5 beneficial guarantees that will make your experience with our service enjoyable, easy, and safe.

Money-back guarantee

You have to be 100% sure of the quality of your product to give a money-back guarantee. This describes us perfectly. Make sure that this guarantee is totally transparent.

Read more

Zero-plagiarism guarantee

Each paper is composed from scratch, according to your instructions. It is then checked by our plagiarism-detection software. There is no gap where plagiarism could squeeze in.

Read more

Free-revision policy

Thanks to our free revisions, there is no way for you to be unsatisfied. We will work on your paper until you are completely happy with the result.

Read more

Privacy policy

Your email is safe, as we store it according to international data protection rules. Your bank details are secure, as we use only reliable payment systems.

Read more

Fair-cooperation guarantee

By sending us your money, you buy the service we provide. Check out our terms and conditions if you prefer business talks to be laid out in official language.

Read more
error: Content is protected !!