16- Sound, Paper 2 (Section A) Flashcards
Fig 6.1 shows a girl standing a few hundreds meter in front a large building. (16) Pg 1 (theory B)
The girl uses a signal generator and a loudspeaker to send a short pulse of sound towards the building. The sound has a frequency of 3700 Hz
A short time later, the girl hears an echo
(a) State what is meant by the term echo
(b) The pitch of the echo is the same as that of the original sound but the echo is not as loud
State what has happened to
i) the amplitude of the sound wave,
ii) the frequency of the sound wave
(c) The speed of sound wave
Fig 6.1 shows a girl standing a few hundreds meter in front a large building. (16) Pg 1 (theory B)
The girl uses a signal generator and a loudspeaker to send a short pulse of sound towards the building. The sound has a frequency of 3700 Hz
A short time later, the girl hears an echo
(a) State what is meant by the term echo
(b) The pitch of the echo is the same as that of the original sound but the echo is not as loud
State what has happened to
i) the amplitude of the sound wave,
ii) the frequency of the sound wave
(c) The speed of sound air is 330 m/s
Calculate the wavelength of this sound
Both sound and ultrasound are longitudinal waves
(a) Describe what is meant by longitudinal
(b) Fig 5.1 shows an ultrasound cleaner being used to clean jewelry
The jewelry is lowered into the cleaning fluid and ultrasound waves of frequency 42 000 Hz are produced in the fluid
i) The speed of ultrasound in fluid is 1500 m/s
Calculate the wavelength of the ultrasound in the fluid
ii) Describe how the ultrasound cleans the jewelry
