In our daily life, we come across so many people having a different voice. A mother talking to her kid has different voice compared to that of the kid. Did you ever think why every person have a different voice if they are speaking at the same loudness? Let’s learn about the loudness of sound, pitch of the sound and their difference.
Loudness of sound:
- The loudness of a sound depends on the amplitude of the sound wave. If the amplitude of the sound wave is large then the sound is loud.
- It is directly proportional to the square of the amplitude of vibration. If the amplitude of sound wave becomes double then the loudness of the sound will be quadrupled.
- It is expressed in decibel (dB).
- Sounds above 80 dB become noise.
- The table given below gives us the data for the loudness of sound from various sources.
- The pitch of the sound depends on the frequency of vibration.
- If the frequency of vibration is higher, we say that the sound is shrill and has a high pitch.
- The sound is said to have lower pitch if it has a lower frequency of vibration.
- A bird produces high pitch sound whereas roaring of a lion is a low pitched sound.
- Voice of a woman has high pitch than that of a man.
Difference between Pitch and Loudness:
Pitch and loudness seem to be same sometimes but they are not exactly the same. They differ on the basis of their tone quality. The pitch of a sound is our ear’s response to the frequency of sound. Whereas loudness depends on the energy of the wave. In general, the pitch is the reason behind the difference in voice quality of different individuals.
The pitch of a sound depends on the frequency while loudness of a sound depends on the amplitude of sound waves.
To know more about sound, its properties (loudness and pitch) download Byju’s- The Learning App.