- Books Name
- Science Made Easy Science Book
- Publication
- Science Made Easy
- Course
- CBSE Class 9
- Subject
- Science
Introduction
→ The sensation felt by our ears is called sound.
→ Sound is a form of energy which makes us hear.
→ Law of conservation of energy is also applicable to sound.
→ Sound travels in form of wave.
Production of Sound
→ Sound is produced when object vibrates or sound is produced by vibrating objects.
→ The energy required to make an object vibrate and produce sound is provided by some out
source (like our hand, wind etc.).
→ Example: Sound of our voice is produced by vibration of two vocal cords in our throat.
• Sound of a drum or tabla is produced by vibration of its membrane
when struck.
→ In laboratory experiments, sound is produced by vibrating tuning fork. The vibrations of tuning fork
can be shown by touching a small suspended pith ball (cork ball) with a prong of the sounding
tuning fork. The pith ball is pushed away with a great force.
→ In laboratory experiments, sound is produced by vibrating tuning fork. The vibrations of tuning fork
can be shown by touching a small suspended pith ball (cork ball) with a prong of the sounding
tuning fork. The pith ball is pushed away with a great force.
• Sound can be produced by following methods:
(i) By vibrating string (sitar)
(ii) By vibrating air (flute)
(iii) By vibrating membrane (table, drum)
(iv) By vibrating plates (bicycle bell)
(v) By friction in objects
(vi) By scratching or scrubbing the objects etc