Complete each of the following sentences by choosing the correct term from the word bank.
(loudness, echoes, pitch, noise, solids, sound quality, vibrations, wavelength, frequency, wave, vacuum, amplitude, lesser, infrasonics, ultrasonics).
The measure of how high or low a sound is called .......... .

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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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State whether the following statements are true or false:

(a) Sound cannot travel in vacuum.

(b) The number of oscillations per second of a vibrating object is called its time-period.

(d) The lower the frequency of vibration, the higher is the pitch.

(e) If the amplitude of vibrations is doubled, the loudness of sound also gets doubled.

(f) When the amplitude of vibrations is halved, the loudness of sound becomes one-fourth.

(g) Unwanted or unpleasant sound is termed as music.

(h) Noise pollution may cause partial hearing impairment.

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In the following sentence. say 'True' and 'False'

(a)

Sound can't travel in vacuum (T/F)

(b)

The number of oscillations per second of a vibrating object is called its time period. (T/F)

(c)

If the amplitude of vibration is large, sound is feeble. (T/F)

(d)

For human ears, the audible range is 20Hz to 20,000Hz. (T/F)

(e)

The lower the frequency of vibration, the higher is the pitch.

(f)

Unwanted or unpleasant sound is termed as music. (T/F)

(g)

Noise pollution may cause partial hearing impairment. (T/F)

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What is : periodic time, simple harmonic motion , wave, wave length, amplitude, frequency, wave velocity, audible sound, infrasonic sound, ultrasonic sound, echo and reverberation

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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.

(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.

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