12.1 The Wave Nature of Sound

All sounds are waves produced by...

• the moving of objects

• the vibrations of material objects.

• supersonic jets

Sound generally moves faster in....

• denser mediums

• rarer mediums

The speed of sound in air is approximately....

• 340 ms^-1

• 3,000 ms^-1

• 3 x 10⁸ ms^-1

Can sound waves be polarised?

• Yes

• No

• Maybe

Why can sound waves not be polarised?

• Because they are longitudinal waves

• Because they are transverse waves

• Because they are absolute rebels

Echoes in caves are an example of.....

• refraction of sound waves

• reflection of sound waves

• diffraction of sound waves

• interference of sound waves

Hearing someone call from another room is an example of.......

• refraction of sound waves

• diffraction of sound waves

• interference of sound waves

• reflection of sound waves

A signal generator produces a wave of ______________.

• various frequencies

• a single frequency

Hearing sound more clearly on a cold night than a warm day is because.....

• Sound waves are being refracted due to the temperature of the air

• Sound waves are being reflected

• Sound waves are being diffracted due to the temperature of the air

• Sound waves are interfering with each other due to the temperature of the air

True or False: Sound travels faster in cold air than in warm air?

• True

• False