Difference between intensity and loudnes?

Question

Answer

The loudness depends on energy per unit area of the wave and on the response of the ear
BUTIntensity depends only on the energy per unit area of the wave and not on the response of the ear.

Answer

Loudness is subjective it depends on the senation of hearing of the person.However Intensity is objective.It is a unit which can be measured.

Answer

The amount of sound energy passing each second through unit area is called the intensity of sound

but

loudness is a measure of the response of the ear to the sound .

Answer

Intensity and Loudness: Explained in Detail

Introduction:
Intensity and loudness are two concepts commonly associated with sound. While they are related, they have distinct meanings and measurements. Understanding the difference between intensity and loudness is crucial to comprehending the perception and measurement of sound.

What is Intensity?
Intensity refers to the amount of energy that sound waves carry per unit of area. It is a physical quantity that can be measured objectively. Intensity is directly related to the amplitude of sound waves, which represents the magnitude of the displacement of air particles caused by the sound. It is typically measured in watts per square meter (W/m²) or decibels (dB), which is a logarithmic scale.

What is Loudness?
Loudness, on the other hand, is a subjective perception of sound. It is the human perception of the intensity of a sound. Loudness is influenced by various factors, including the characteristics of the sound source, the distance from the source, and the sensitivity of the human ear. It is measured in units called 'phon.'

Key Differences:
1. Objective vs. Subjective:
- Intensity is an objective measure of the physical energy carried by sound waves.
- Loudness is a subjective perception of the intensity of sound experienced by an individual.

2. Measurement:
- Intensity is typically measured in watts per square meter (W/m²) or decibels (dB).
- Loudness is measured in units called 'phon,' which takes into account the frequency response of the human ear.

3. Factors Affecting Perception:
- Intensity is influenced by the source's energy output, distance from the source, and the area over which the sound spreads.
- Loudness is affected by the individual's hearing sensitivity, frequency characteristics of the sound, and other psychoacoustic factors.

4. Relationship:
- Intensity and loudness are related but not directly proportional. Doubling the intensity of a sound wave does not necessarily result in a perceived doubling of loudness.
- The relationship between intensity and loudness follows a logarithmic scale. This means that a tenfold increase in intensity corresponds roughly to a doubling of loudness.

Conclusion:
In summary, intensity refers to the physical energy carried by sound waves and can be measured objectively, while loudness is a subjective perception of the intensity experienced by an individual. Intensity is quantified in units such as watts per square meter or decibels, whereas loudness is measured in phon. Understanding the distinction between intensity and loudness is essential for comprehending the physics and perception of sound.

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