Vocal chord of females or babies are tender, so, while they speak or sing the chords vibrate with high frequency, that is why their voices are very sharp. Vocal chords of male persons are usually stiff, so their frequency of vibration is low and hence male voices are generally flat.

• The displacement of the particle at any instant is defined as the distance of the oscillating particle at that instant from its mean position.

• The maximum displacement of the oscillating particle from its mean position is called the amplitude of the particle.

• While we speak, sound is produced in the form of a voice by the vibration of our vocal chord.   
• The time taken by the oscillation particle to complete on oscillation is called its time https//:www.physicsnotes.shop period. It is usually denoted by T.

1. List three points which an engineer should use in designing an auditorium.
2. What is nascent hydrogen? Show a reaction to explain that the idea of nascent hydrogen is baseless