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(a) sound is produced when a body undergoes to and fro movement
(b) The number of cycles that a vibrating object completes in one second is called frequency
(c) The pitch of a sound depends on the frequency
(d) Sound waves need to travel through a medium such as solids, liquids and gases.
(e) People can hear sounds at frequencies from about 20 Hz to 20,000 Hz
(f) sound requires a medium for propagation
(g) sound travels faster in solids than in liquids
(h) the sound heard after reflection is Echo
(B) 1. Sound is produced when an object vibrates, creating a pressure wave. This pressure wave causes particles in the surrounding medium (air, water, or solid) to have vibrational motion. The human ear detects sound waves when vibrating air particles vibrate small parts within the ear.
2. sound is a vibration that propagates as an acoustic wave, through a transmission medium such as a gas, liquid or solid. In human physiology and psychology, sound is the reception of such waves and their perception by the brain.Sound waves below 20 Hz are known as infrasound.
3. The motion in which certain part or parts of a body always remain fixed and do not move while the rest of the body moves to and fro in a definite style is called vibratory motion.
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