Sound requires a medium to travel through. True or False?

True. Sound is a type of mechanical wave and requires a medium such as air, water, or solids for transmission.

What is the typical audible range for humans in Hertz?

The typical range of hearing for most people is between 20 Hz and 20 kHz.

Sound is produced by the ___ of objects, which creates ___ waves composed of compressions and rarefactions.

Vibration; longitudinal

True or False: Sound can only be produced by vibrating strings or air columns.

False; sound can also be produced by plucking, scratching, rubbing, blowing, or shaking different objects.

Fill in the blanks: In a sound wave, the area of ___ corresponds to high pressure, whereas the area of ___ corresponds to low pressure.

Compression; rarefaction

In longitudinal waves, the particles of the medium move ___ to the direction of wave travel.

Parallel

Name the type of wave in which particles do not oscillate along the direction of wave propagation.

Transverse Wave 

The speed of sound is affected by the ___ and ___ of the transmitting medium.

Nature and temperature

True or False: Sound waves travel faster in gases than in solids.

False. Sound waves travel slower in gases than in solids.

What is the relationship between the angle of incidence and the angle of reflection when sound waves hit a surface?

The angle of incidence is equal to the angle of reflection in relation to the normal at the point where the sound wave strikes the surface.

To hear a distinct echo, the time gap between the original sound and the reflected sound must be at least ___ seconds.

0.1 seconds

True or False: An echo can only occur once when sound is reflected off a surface.

False. An echo can happen more than once due to repeated reflections.

Fill in the blank: For a distinct echo, the minimum distance between the sound source and the reflecting surface should be ___ metres.

17.2

What is required for sound waves to reflect off a surface?

A sufficiently large obstacle is needed for sound waves to reflect, regardless of whether the surface is smooth or rough.