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GROUP 2 answers :)
g1 (a) noise pollution
- unwanted, unnecessary sound that can influence human mental and physical health.
-commonly generated inside many industries, highway, railway and airplane traffic and construction activities.
g1 (b) the most preferred noise control strategies in workplace are by reducing the sound output of the source and by interrupting the pathway of the sound.
g3 HF sound is much easier to be absorbed than LF because HF have more cycles in one second. When it travels to one medium, it vibrates the particles rapidly. So the energy from HF sounds will transmit faster to the particles.

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G4 : Example of harmonic content and dynamic characteristics of sounds are vibrato & attack decay envelope of the sound.
Vibrato is known as "periodic changes in the pitch of the tone".It is a temporal modulation of rate & depth.
Attack is  when there is a rapid rise to its peak amplitude of the sound waves & decay is when the amplitude gradually decreases.
So, low energy at low harmonics, with slow attack and slow vibrato produces a dull sound quality whereas high energy at high harmonics, with rapid attack and produces a "bright" quality.

G3 : HF have short wavelength.Have higher particles velocity so, it is better absorbed. LF have longer wavelength. It has low velocity, low absorption ability.

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G2:
Timbre is perception of the quality of sound.
Just like, amplitude (measurable) vs loudness (perception), so complexity vs timbre.

G3: high f, particles vibrate rapidly( result in short wavelength), so it run out energy quickly. Thus, it is easy to be absorbed.
For example, rubbing hands very rapidly

https://dosits.org/science/movement/why-does-sound-get-weaker-as-it-travels/sound-absorption/

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G1
1. Excessive Unwanted sound or unpleasant sound that cause negative impact on human activities
2. Noise could be in the sense of unwanted sounds, such as music played too loud or too late in the evening and noise in the sense of non-musical or non-linguistic sound, such as that produced by animals.

G2
1. Timbre determined by harmonic content of a sound and the dynamic characteristic of the sound such as vibrato and attack decay time by using fourier analysis. We can use Oscilloscope

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G2.Timbre is one of the characteristics of sound quality. How do we determine/ measure it?

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How harmonic content and dynamic characteristics affect timbre?

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1. What is meant by noise pollution?
2. What is the most prefered noise control strategies in workplace settings?

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Why HF is easier to be absorbed than LF?

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-sound energy is an acoustic energy that cause mechanical vibration.
-sound pressure is the difference between the pressure caused by a sound wave and the ambient pressure of the media the sound wave is passing through

-si unit for sound energy is joule.
-si unit for sound pressure is pascal.

-sound energy will not be affected by environmental factors.
-sound pressure can be affected by environmental factor such as room size.

-sound energy cannot be measured directly.
-sound pressure can be measured directly.

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What is the difference between sound energy and sound pressure

1. Unit for sound energy is joule, whereas sound pressure Pa.
2. Sound energy will not affected by barriers, whereas sound pressure will be affected by barriers.
3. Sound energy cannot be measured by using slm whereas sound pressure can be measured using slm.
4. I=P/A whereas I=intensity, P= power, A=area. When area increase, intensity will decrease.
5. Pressure=power/area^2

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1. Sound energy measured in joule or watt second, sound pressure measured pascal unit.
2. Sound pressure indicates the amplitude level in specific location, sound power sound emitted from an obj independent of loacation and distance
3. Sound pressure influcend by environment, while sound energy does not.
4. Sound energy is a form of energy distributed over the area of contact in the form of preessure while sound pressure is what we heard
5.

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PRESSURE
- is what we hear
- is the difference between the pressure caused by a sound wave and the ambient pressure of the the atmosphere
- can physically measure by using SLM
- unit: Pa
- Depends on distance, position of source and environment.

ENERGY
- a form of energy related with the vibration
- unit: joule
- Not dependent on distance, position and environment

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Audiologist role in noise control :

-To evaluate the noise control recommendations made by the engineers
-To be equipped and updated with noise control knowledge and techniques
-To give professional opinions regarding noise control
-To increase awareness about noise induce hearing loss

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Audiologist are the one who are knowledgeable about normal and abnormal anatomy  and physiology of the auditory systems and how it works especially towards noise. Thus its their role in prevention of significant, permanent HL resulting from noise exposure.

besides, making the
noise survey should include details about the frequency
composition, noise level and duration of noise exposure in
these areas.
also to create awareness to thepublic about the affect  of noise exposure.

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Differences:
1. Sound energy cant affected by environment, while sound pressure is will be affected by environment

Audiologist role:
1. Able to consult the client regarding the importance of noise control
2. Able to work together with engineering in noise control
3. Able to give the options for client regarding different methods in noise control

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Audiologists role in noise control
1. Educate the public about impact of NIHL
2. Teach the public about HPD
3. To evaluate the noise level
4. To evaluate the needs of hpd
5. Recommend strategies for noise control to the factory
6. Contribute in measuring the action level

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Q2: What is the differences between sound energy and sound pressure

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Q2: What is the differences between sound energy and sound pressure