A loud speaker emits sound waves.

1.   ?    QP only
2.   ?    RS only
3.   ?    QP and TU
4.   ?    RS and TU

A marine survey ship sends a sound wave straight down to the sea bed. It receives an echo 1.5 s later.
The speed of sound in sea water is 1 500 m/s.
How deep is the sea at this position?

1.   ?    1 000 m
2.   ?    1 125 m
3.   ?    2 250 m
4.   ?    4 500 m

A guitar string is made to virbrate.
What would make the pitch of the note rise?

1.   ?    A decrease in the amplitude of vibration.
2.   ?    A decrease in the frequency of vibration.
3.   ?    An increase in the amplitude of vibration.
4.   ?    An increase in the frequency of vibration.

A student stands 330 m from a tall cliff which is 990 m from another tall cliff. The student fires a starting pistol and hears some echoes.

1.   ?    1.0 s
2.   ?    2.0 s
3.   ?    3.0 s
4.   ?    6.0 s

What happens to a sound wave when the note heard gets louder?

1.   ?    Its amplitude increases.
2.   ?    Its frequency increases.
3.   ?    Its speed increases.
4.   ?    Its wavelength increases.

A violin is played to give a sound wave with a larger amplitude and lower frequency than a sound wave from a flute.
Which instrument produces the louder sound which produces the sound of higher pitch?

1.   ?    Louder sound: flute; Higher pitch: flute
2.   ?    Louder sound: flute; Higher pitch: violin
3.   ?    Louder sound: violin; Higher pitch: flute
4.   ?    Louder sound: violin; Higher pitch: violin

Why is there no sound is space?

1.   ?    Because there is no air
2.   ?    Because there is no gravity
3.   ?    Because there is no light
4.   ?    Because there is no magnetic field

Which frequency is approximately in the middle of the human audible range?

1.   ?    20 Hz
2.   ?    2000 Hz
3.   ?    5000 Hz
4.   ?    10 000 Hz

If and object is to produce sound, it must be able to ......................

1.   ?    bend
2.   ?    expand
3.   ?    rotate
4.   ?    vibrate

A note is played on a piano with frequency of 50 Hz. Sound travels at 300m/s in air.
What is the wavelength of the note?

1.   ?    6m
2.   ?    50m
3.   ?    250m
4.   ?    300m

In which situation could sound waves not travel?

1.   ?    Between two spaceships in space
2.   ?    From a surface ship to a submarine
3.   ?    From inside a diving chamber to a microphone in water outside
4.   ?    Through a balloon filled with helium gas

Which of the following does not produce a sound wave that can be heard?

1.   ?    A bell ringing under water.
2.   ?    A gun fired in a room with no echoes.
3.   ?    A hammer hitting a metal bar.
4.   ?    An explosion in outer space.

Two notes are played on a guitar. The second is louder and has a higher pitch.
The second note is ........................

1.   ?    higher in amplitude and lower in frequency
2.   ?    higher in both amplitude and frequency
3.   ?    lower in amplitude and higher in frequency
4.   ?    lower in both amplitude and frequency

A star in outer space exploded and emitted radiation.

Which waves could not reach the Earth from the exploding star?

1.   ?    infra-red
2.   ?    light
3.   ?    radio
4.   ?    sound

On what do the pitch and loudness of a sound wave depend?

1.   ?    Pitch: Amplitude; Loudness: Frequency
2.   ?    Pitch: Frequency; Loudness: Amplitude
3.   ?    Pitch: Frequency; Loudness: Speed
4.   ?    Pitch: Speed; Loudness: Amplitude

The speed of a 100 Hz wave was measured on four different days.

On which day did the wave have the longest wavelength?

1.   ?    Day A: Speed of wave: 315 m/s
2.   ?    Day B: Speed of wave: 320 m/s
3.   ?    Day C: Speed of wave: 335m/s
4.   ?    Day D: Speed of wave: 340 m/s

The diagram show oscilloscope traces of sound picked up by microphones. The oscilloscope controls are set in the same position for all traces.

1.   ?    A
2.   ?    B
3.   ?    C
4.   ?    D

The speed of sound is different in air, steel and water.

Which of the following gives the order of speed (slowest to fastest)?

1.   ?    air, water, steel
2.   ?    air, steel, water
3.   ?    steel, air, water
4.   ?    steel, water, air

What is the approximate range of audible frequency for a human?

1.   ?    1 Hz --> 20 Hz
2.   ?    20 kHz --> 20 Hz
3.   ?    20 kHz --> 200 Hz
4.   ?    1000 kHz --> 20 000 kHz

A loudspeaker produces a continuous sound wave of frequency 200 Hz in the air, in the direction of a molecule P.

1.   ?    A
2.   ?    B
3.   ?    C
4.   ?    D

A place where the sound waves cannot travel would be ......................

1.   ?    through a balloon filled with helium
2.   ?    from one spaceship to another one nearby
3.   ?    from a surface ship to a submarine
4.   ?    along a railway line

A flash of lightning is seen and corresponding thunder clap in heard 6 s apart. Upon calculation, it is estimated that they take place about 1800 m.

What is the calculation based on?

1.   ?    Sound travels 300 m/s faster than light.
2.   ?    Light travels almost instantaneously but sound travels at 300 m/s.
3.   ?    Sound travels alomost instantaneously but light travels at 300 m/s.
4.   ?    Light travels 300 m/s faster than sound.