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Sound

Question
CBSEENSC8005771
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Define the following terms :

(i) Frequency

(ii) Amplitude

(iii) Decibel

(iv) Music

(v) Noise

Solution

(i) Frequency: Frequency is defined as the number of oscillations per second. 

(ii) Amplitude: Amplitude is defined as the maximum displacement of a particle from its rest position. 

(iii) Decibel: Decibel is the unit to measure the loudness of sound.

(iv) Music: Sound which is pleasant to ears is called music.

(v) Noise: Sound which is unpleasant to ears is called noise. 

Some More Questions From Sound Chapter

Voice of which of the following is likely to have minimum frequency:

State True or false:

Sound cannot travel in vacuum.

In the following statements, tick ‘T’ against those which are true, and ‘F’ against those which are false :

State True or False:

If the amplitude of vibration is large, sound is feeble.

For human ears, the audible range is 20 Hz to 20,000 Hz.

State True or False:

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

State True or False: 

Unwanted or unpleasant sound is termed as music.

State True or False:

Noise pollution may cause partial hearing impairment.

Time taken by an object to complete one oscillation is called __________.

Loudness is determined by the __________ of vibration.

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