Class 9 Exam > Class 9 Notes > Pitch, Amplitude, Loudness, Intensity
Pitch, Amplitude, Loudness, Intensity - Class 9 PDF Download
- Pitch: Frequency determines the shrillness or the pitch of the sound. Higher the frequency, higher the pitch or it is said that the sound is shrilling. Lower the frequency, lower the shrill or pitch. Eg: Babies voice has more frequency and thereby more shrilling than an adult voice.
- Amplitude: It is a measure of the loudness or softness of the sound. The magnitude of the maximum disturbance in the medium on either side of the mean value is called Amplitude of the wave, represented by the letter A.
- Loudness: Loudness is the response of ear to the sound. Loudness is proportional to the square of the amplitude of the vibration body producing sound. The more the amplitude of vibration, the sound is the loud. The lesser the amplitude of vibration, the sound is feeble.
Loudness = k.(Amplitude)2 (where k is the proportionality constant)
The loudness is expressed in a unit called decibel (dB).
- Intensity : The amount of soundenergy passing each second through unit area is called the Intensity of Sound.
FAQs on Pitch, Amplitude, Loudness, Intensity - Class 9
| 1. What is pitch? |  |
Ans. Pitch refers to the perceived frequency of a sound. It is the attribute that allows us to differentiate between high and low sounds. A high pitch sound has a higher frequency, while a low pitch sound has a lower frequency.
| 2. What is amplitude? | |
Ans. Amplitude is the measure of the strength or intensity of a sound wave. It determines the volume or loudness of a sound. A larger amplitude corresponds to a louder sound, while a smaller amplitude corresponds to a softer sound.
| 3. What is loudness? | |
Ans. Loudness is a subjective perception of sound intensity. It refers to how loud or soft a sound is perceived by an individual. It is influenced by the amplitude of a sound wave, but can also be affected by factors such as distance from the sound source and individual hearing ability.
| 4. What is intensity? | |
Ans. Intensity is the physical measure of sound energy per unit area. It is directly proportional to the square of the amplitude of a sound wave. Intensity is often measured in decibels (dB) and provides an objective measure of sound loudness.
| 5. What is the relationship between pitch and frequency? | |
Ans. Pitch and frequency are closely related. Pitch is the subjective perception of frequency. Frequency, on the other hand, is the objective measure of the number of complete vibrations or cycles of a sound wave per unit of time. In general, higher frequencies are associated with higher pitches, and lower frequencies are associated with lower pitches.
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Jan 07, 2025
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