Sound Transmission

What happens to sound as it travels over a distance?

• It gets louder

• It fades away

• It remains the same

• It speeds up

What is the effect of obstacles on sound waves?

• They make sound louder

• They have no effect

• Sound waves encounter obstacles

• They speed up sound

When sound is propagated in a free, unbounded medium, intensity decreases in a lawful way. What is this law called?

• Law of Reflection

• Inverse Square Law

• Law of Refraction

• Law of Conservation

• watts

• joules

• meters

• seconds

If the power remains constant but the surface area increases, what happens to intensity?

• It must decrease

• It must increase

• It remains the same

• It becomes zero

Spherical wave fronts become larger as they move outward from the source.

• True

• False

Refer to the diagram showing concentric circles labeled A, B, and C. What do these circles represent in the context of sound transmission?

• They represent spherical wave fronts formed by compressions.

• They represent the paths of individual sound particles.

• They represent the boundaries of different sound frequencies.

• They represent the direction of air flow during sound transmission.

If the distance from the sound source is doubled, across how much area is the sound power now distributed?

• 1 m^2

Explain why intensity decreases as the distance from the sound source increases, according to the inverse square law.

• Because the energy spreads out over a larger area as distance increases.

• Because the sound source loses energy as it travels.

• Because the air absorbs all the sound energy.

• Because the frequency of the sound decreases with distance.

The inverse square law only holds strictly in which type of medium? Choose the correct answer.

• Free, unbound medium with no obstacles

• Medium with obstacles

• Water

• Air