# In the following statements, tick ‘T’ against those which are true, and ‘F’ against those which are false.$(a)$. Sound cannot travel in a 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 the vibration is large, the sound is feeble. (T/F)$(d)$. For human ears, the audible range is 20 Hz to 20,000 Hz. (T/F)$(e)$. The lower the frequency of vibration, the higher the pitch. (T/F)$(f)$. An unwanted or unpleasant sound is termed music. (T/F)$(g)$. Noise pollution may cause partial hearing impairment. (T/F)

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$(a)$. Sound cannot travel in vacuum. $(T)$

Explanation:

Sound is a longitudinal wave that requires a medium to travel$(solid,\ liquid,\ gas)$. A sound wave can not travel in vacuum.

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

Explanation:

The number of oscillations per second of a vibrating object is called its frequency.

$(c)$. If the amplitude of vibration is large, sound is feeble. $(F)$

Explanation:

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

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

Explanation:

Sound waves below 20 Hz or above 20,000 Hz are beyond the audible range of the human ear.

$(e)$. The lower the frequency of vibration, the higher is the pitch. $(F)$

Explanation:

The lower the frequency of vibration, the lower the pitch as the pitch of a sound wave is directly proportional to the frequency of a sound wave.

$(f)$. Unwanted or unpleasant sound is termed as music. $(F)$

Explanation:

An unwanted or unpleasant sound is termed noise.

$(g)$. Noise pollution may cause partial hearing impairment. $(T)$

Explanation:

Noise pollution is caused by high noise levels. It causes several adverse effects in humans. Noise pollution can lead to hearing impairment, high blood pressure, high-stress levels, etc.

Updated on 10-Oct-2022 13:25:05