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?
1 000 m
1 125 m
2 250 m
4 500 m
A guitar string is made to virbrate. What would make the pitch of the note rise?
A decrease in the amplitude of vibration.
A decrease in the frequency of vibration.
An increase in the amplitude of vibration.
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.
If the speed of sound between the cliffs is 330 m/s, what is the interval between the first echo and the second echo?
1.0 s
2.0 s
3.0 s
6.0 s
What happens to a sound wave when the note heard gets louder?
Its amplitude increases.
Its frequency increases.
Its speed increases.
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?
Louder sound: flute; Higher pitch: flute
Louder sound: flute; Higher pitch: violin
Louder sound: violin; Higher pitch: flute
Louder sound: violin; Higher pitch: violin
Why is there no sound is space?
Because there is no air
Because there is no gravity
Because there is no light
Because there is no magnetic field
Which frequency is approximately in the middle of the human audible range?
20 Hz
2000 Hz
5000 Hz
10 000 Hz
If and object is to produce sound, it must be able to ......................
bend
expand
rotate
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?
6m
50m
250m
300m
In which situation could sound waves not travel?
Between two spaceships in space
From a surface ship to a submarine
From inside a diving chamber to a microphone in water outside
Through a balloon filled with helium gas
Which of the following does not produce a sound wave that can be heard?
A bell ringing under water.
A gun fired in a room with no echoes.
A hammer hitting a metal bar.
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 ........................
higher in amplitude and lower in frequency
higher in both amplitude and frequency
lower in amplitude and higher in frequency
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?
infra-red
light
radio
sound
On what do the pitch and loudness of a sound wave depend?
Pitch: Amplitude; Loudness: Frequency
Pitch: Frequency; Loudness: Amplitude
Pitch: Frequency; Loudness: Speed
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?
Day A: Speed of wave: 315 m/s
Day B: Speed of wave: 320 m/s
Day C: Speed of wave: 335m/s
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.
Which trace shows the loudest, lower-picked, sound?
A
B
C
D
The speed of sound is different in air, steel and water.
Which of the following gives the order of speed (slowest to fastest)?
air, water, steel
air, steel, water
steel, air, water
steel, water, air
What is the approximate range of audible frequency for a human?
1 Hz --> 20 Hz
20 kHz --> 20 Hz
20 kHz --> 200 Hz
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.
Name the diagram that best represents how the sound causes P to move during 1/200 s.
A
B
C
D
A place where the sound waves cannot travel would be ......................
through a balloon filled with helium
from one spaceship to another one nearby
from a surface ship to a submarine
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?
Sound travels 300 m/s faster than light.
Light travels almost instantaneously but sound travels at 300 m/s.
Sound travels alomost instantaneously but light travels at 300 m/s.