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Sound — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceSound4 Marks
Question
Sound is produced by vibrating objects. The matter or substance through which sound is transmitted is called a medium. It can be solid, liquid or gas. Sound moves through a medium from the point of generation to the listener. When an object vibrates, it sets the particles of the medium around it vibrating. The particles do not travel all the way from the vibrating object to the ear. Sound waves are characterized by the motion of particles in the medium and are called mechanical waves.When a vibrating objectmoves forward, it pushes and compresses theair in front of it creating a region of highpressure; this region is called a compression$(C)$.When the vibrating object moves backwards,it creates a region of low pressure calledrarefaction $(R)$. Hence sound is longitudinal wave.
(i) Sound waves are
$(a)$ Mechanical waves
$(b)$ Electromagnetic wave
$(c)$ Transverse waves
$(d)$ None of these
(ii) Sound travel in medium with
$(a)$ Compression and rare fraction
$(b)$ Crest and trough
$(c)$ Both can be possible
$(d)$ None of these
(iii) Compression is the region of
$(a)$ High pressure
$(b)$ Low pressure
$(c)$ Medium pressure
$(d)$ None of these
(iv) What is sound and how is it produced?
(v) Why sound wave is called as longitudinal wave?
✓

Answer

$(i) a$
$(ii) a$
$(iii) a$
$(iv)$ Sound is vibrations created by object. When body vibrates, it forces the adjacent particles of the medium to vibrate. This results in disturbance in the medium, which travels as waves an reaches the ear hence sound is produced.
$(v)$ The vibration of medium that travels parallel to direction of wave or along in the direction of the wave is called longitudinal wave. The direction of particles of medium vibrates parallel to direction of propagation of disturbance. Therefore a sound is called longitudinal waves.

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