Question

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Answer 1

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sound can easily travel through vacuum.

• false

sound cannot travel through a mixture of gases.

• true

noise pollution poses great health risks.

• true

the greater the amplitude, the louder is the sound

• true

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

• true

the si unit of time period is second.

• true

Answer 2

Answer:

1) False

{for sound to be propagated, vibration is needed and for vibration, particles are needed. In vaccum, no particles are there, so sound can not travel through vaccum}

2) False

{For sound to travel, vibration is needed and for vibration, particles are needed. Gases have particles, so, it doesn't matter, whether a single gas is there or a mixture of gases}

3) True

{stress and poor concentration to hearing disorder}

4) True

{Loudness is directly proportional to amplitude}

5) False

{Pitch is directly proportional to frequency}

6) True