4.16 Sound Refraction and Diffraction

Select all that apply. Sound diffraction can be thought of as

• moving around an obstacle

• amplifying as a result of greater intensity

• reflecting off a surface

• spreading out after going through a small opening

Which diffracts more?

• Sounds with longer wavelengths

• Sounds with shorter wavelengths

When listening to speakers in another room, we hear the bass notes more than the treble notes because

• the bass notes have a higher frequency and therefore diffract more

• the bass notes have a lower frequency and therefore diffract more

• the bass notes have a higher frequency and therefore diffract less

• the bass notes have a higher frequency and therefore diffract more

Select all that apply.

• Sound refracts when it travels from warm air into cold air.

• Sound refracts when travelling in warm air.

• Sound refracts when it travels from cold air into warm air.

• Sound refracts when travelling in cold air.

Which statement is true?

• It's easier to locate a higher frequency sound source because its sound is more directional.

• It's harder to locate a higher frequency sound source because its sound is more directional.

• It's easier to locate a lower frequency sound source because its sound is more directional.

• It's harder to locate a lower frequency sound source because its sound is more directional.

Are sounds refracted in their entirety?

• Yes

• No, only certain frequencies are refracted.

• No, some of the produced sound is absorbed by objects in the environment.

• No, sound does not refract.

During night time, we can hear music more loudly (higher intensity) because

• the air is cooler than the ground, so sound refracts toward the normal

• the air is cooler than the ground, so sound refracts away from the normal

• the ground is cooler than air, so sound refracts toward the normal

• the ground is cooler than air, so sound refracts away from the normal