Sound part 1

Sound is

• a wave which travels through any material or a vacuum.
  

• 
  a wave which travels only through air.
  

• 
  a wave which travels through many materials but not a vacuum

• particles which travel through most things.

Sound in air can best be described as a

• transverse pressure wave of compressions and rarefactions in air.

• transverse displacement wave which travels through air.

• transverse polarised pressure wave in air.
  

• longitudinal wave of air compressions and rarefactions.

The speed of sound in air is about

• 100 m/s

• 300 m/s

• 1000 m/s

• 340 m/s²

We set up a loud speaker at the front of the room at ear level. the sound waves that pass through the room towards you will cause the air molecules in their path to

• vibrate vertically up and down.
  

• vibrate horizontally back and forward.

• vibrate both vertically and horizontally.

• move toward you in waves.

The ‘pitch’ of a musical note is normally given in terms of its

• amplitude.

• frequency.

• wavelength.

• speed.

..............indicates the loudness of the note

• amplitude

• frequency

• wavelength.

• speed

The speed of any periodic wave is given by

Note: one or more of these may be correct.

• the wavelength times the frequency.
  

• the wavelength times the period.
  

• the wavelength divided by the frequency.

• the wavelength divided by the period.

Why can ultrasound not be heard by humans?

• 1. A  The amplitude is too great.

• 1. B  The frequency is too great.

• 1. C  The speed is too great.

• 1. D  The wavelength is too great.

A sound wave has a certain amplitude and a certain frequency.

A second sound wave is quieter and lower in pitch than the first sound wave.

The second wave has

• 1. A  a larger amplitude and a greater frequency.

• 1. B  a larger amplitude and a smaller frequency.

• 1. C  a smaller amplitude and a greater frequency.

• 1. D  a smaller amplitude and a smaller frequency.

singer sings two notes. The first note is louder and lower in pitch than the second note.

Which statement about the two notes is correct?

• 1. A  The first note has a larger amplitude and a larger frequency than the second note.

• 1. B  The first note has a larger amplitude and a smaller frequency than the second note.

• 1. C  The first note has a smaller amplitude and a larger frequency than the second note.

• 1. D  The first note has a smaller amplitude and a smaller frequency than the second note.