RBSE Class 8 Science Notes Chapter 13 Sound

These comprehensive RBSE Class 8 Science Notes Chapter 13 Sound will give a brief overview of all the concepts.

RBSE Class 8 Science Chapter 13 Notes Sound

→ Sound is produced by a vibrating object. In humans, sound is produced by voice box or larynx.

→ Sound travels through a medium (e.g. gas, liquid or solid). It doesnot travel in vacuum.

→ Ear drum experiences vibrations in sound. The vibrations are sent to brain. This process is called hearing.

→ The to and fro motion of a particle is called vibration. Such motion is called oscillatory motion. No. of oscillations in one second is called frequency. Its unit is hertz (Hz).

→ The more is the amplitude of vibration. the more it is loud. When frequency increases so pitch increasçs and the voice becomes more shrill.

→ Excessive or unwanted sounds in the environment cause noise pollution. Noise pollution may develop health problems for humans.