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Eighth Grade (Grade 8) Waves and Sound Questions

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Grade 8 Waves and Sound
What happens when the speaker cone moves in a forward direction?
  1. Rarefaction occurs
  2. No change in air particles
  3. Compression occurs
  4. Vacuum is created
Grade 8 Waves and Sound
Which of the following mediums sound waves can travel?
  1. Air or water
  2. Light or electricity
  3. Solid objects only
  4. Vacuum
Grade 8 Waves and Sound
What is the range of frequencies that falls under ultrasonic waves?
  1. Below 20 Hz
  2. 20-20,000 Hz
  3. Above 20,000 Hz
  4. 75-150,000 Hz
Grade 8 Waves and Sound
Grade 8 Waves and Sound
What are sounds with frequencies below 20 Hz called?
  1. Infrasonic
  2. Ultrasonic
  3. Audible frequencies
  4. Doppler effect
Grade 8 Waves and Sound
What is the frequency range that the average human ear can perceive?
  1. 2,000-110,000 Hz
  2. 16-12,000 Hz
  3. 20-20,000 Hz
  4. 10,000-80,000 Hz
Grade 8 Waves and Sound
Grade 8 Waves and Sound
The speed of sound in air at room temperature is                      .
  1. 123 meters per second
  2. 231 meters per second
  3. 343 meters per second
  4. 433 meters per second
Grade 8 Waves and Sound
Grade 8 Waves and Sound
Grade 8 Waves and Sound
Which of the following is an example of sound influencing our daily lives?
  1. Seeing colors
  2. Feeling textures
  3. Hearing a doorbell
  4. Tasting flavors
Grade 8 Waves and Sound
What is the relation between the frequency of sound waves and the source’s frequency?
  1. they are inversely proportional
  2. they are directly proportional
  3. they have no relationship
  4. the frequency of a sound wave is always higher than the source’s frequency
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