Question 3 (b)
State whether the following statement is true or false.
The number of oscillations per second of a vibrating object is called its time period.

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Solution

The statement is false.
The number of oscillations per second of a vibrating object is called its frequency. The time period is defined as the time required to complete one oscillation.

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The number of oscillations per second is called the Time Peroid of oscillation

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.

Question 3 (c)
State whether the following statement is true or false.
If the amplitude of vibration is large, the sound is feeble.

Question 3 (e)
State whether the following statement is true or false.
The lower the frequency of vibration, the higher is the pitch.

Question 99

State whether the statement is True or False.

$a \times b = b \times a$

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