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Echo

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Question

Fill in the following blanks with suitable words :

(a) An echo is simply a _ sound .

(b) Pitch of sound depends on _ .

(c) Loudness of sound depends on _ .

(d) Quality of sound depends on _ .

(e) Echoes are caused by the ___ of sound .

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Solution

(a) Reflected

(b) Frequency

(c) Amplitude

(d) Waveform

(e) Reflection

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Q. Fill in the following blanks with suitable words :
(a) An echo is simply a ................... sound.
(b) Pitch of sound depends on ....................
(c) Loudness of sound depends on .....................
(d) Quality of sound depends on ........................
(e) Echoes are caused by the ...................... of sound.

The loudness and pitch of a sound depends on

Write true or false for each statement:

(a) When sound propagates in air,it does not carry energy with it.

(b) In a longitudinal wave,compression and rarefaction are formed.

(c) The distance from one compression to nearest rarefaction is called wavelength.

(d) The frequency is measured in second.

(e) The quality of sound depends on the amplitude of wave..

(f) The pitch of sound depends on frequency..

(g) Decibel is the unit of pitch of a sound.

Q. Pitch of a sound depends on the frequency of a sound.

Q. Mark the following statements true or false. Rewrite the false statements correctly.
(a) Sound has three properties-loudness, frequency and quality.
(b) A sound with large amplitude is louder than one with small amplitude.
(c) The loudness of sound is measured in hertz.
(d) Shortening the string of a guitar lowers its pitch.
(e) The eardrum vibrates when sound waves enter the ear.
(f) Frequency is the number of vibrations per second.
(g) Echoes are produced by the absorption of sound.
(h) Sound travels fastest in solids.
(i) The quality of sound produced by all stringed instruments will be the same.
(j) Radha tightens the string of her veena to raise the pitch of sound.

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