4.11 Production and Transmission of Sound

True or false? Sound requires a medium to travel through in order to be heard.

• True

• False

Sound is a

• transverse wave

• longitudinal wave

• torsional wave

• physics wave

Which of these statements is true?

• Compressions and rarefactions in sound waves have the same amount of pressure in the medium.

• For a given sound wave, its compressions will have lower pressure and its rarefactions with have higher pressure in their medium.

• For a given sound wave, its compressions will have higher pressure and its rarefactions with have lower pressure in their medium.

• All sound waves have high pressure vibrations in a vacuum.

Which statement is false?

• When a sound wave has a high amplitude, it is loud.

• When a sound wave has a low amplitude, it is quiet.

• Sound waves displace molecules within the medium it is travelling in.

• The loudness of a sound depends on its frequency.

Select all that apply.

• Higher pitches are created by greater frequencies.

• Lower pitches are created by lesser frequencies.

• Higher pitches are created by lesser frequencies.

• Lower pitches are created by greater frequencies.