SOUND WAVES

Which range of frequencies typically can be heard by a 10 year-old child?

• 20 Hz-2000 Hz

• 20 Hz-20 000 Hz

• 200 Hz-2000 Hz

• 200 Hz-20 000 Hz

Astronaut 1 uses a hammer to mend a satellite in space. Astronaut 2 is nearby. There is no air in space. Compared with the sound heard if they were working on Earth, what does astronaut 2 hear?

• a louder sound

• a quieter sound

• a sound of the same loudness

• no sound at all

Three loudspeakers vibrate at different frequencies of 5 Hertz, 25 kiloHertz, and 50 kiloHertz.

Which row shows whether the vibration from each loudspeaker can be heard by a human?

• A

• B

• C

• D

In a test, car horn is found to be too loud and the pitch of the note is too high.

What information does this give about the amplitude and the frequency of the sound wave produced?

• A

• B

• C

• D

The diagram represents two sound waves. The scales in two diagrams are same.

Which statement describes the waves?

• The waves have different loudness and different pitch

• The waves have different loudness but the same pitch

• The waves have the same loudness and the same pitch

• The waves have the same loudness but different pitch

A police car siren emits two different sounds P and Q. These are produced alternately. The diagram represents the sound emitted.

• A

• B

• C

• D

The diagram represents two sound waves.

• A

• B

• C

• D

The diagrams show the wave shapes of two different sounds. The scales are the same in each diagram.

How does sound 2 compare with sound 1?

• Sound 2 is louder than sound 1

• Sound 2 is quieter than sound 1

• Sound 2 has a higher pitch than sound 1

• Sound 2 has a lower pitch than sound 1

The diagrams represent the waves produced by four sources of sound. The scales are same for all the diagrams.

Which sound has the highest frequency?

• 
• 
• 
• 

Sounds are produced by vibrating objects. A certain object vibrates but a person nearby cannot hear any sound.

Which statement could explain why nothing is heard?

• The amplitude of the sound wave is too large

• The frequency of the vibration is too high

• The sound waves are transverse

• The speed of the sound wave is too high