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6th grade light, sound and waves

6th grade (Year 7 in England) · 16 questions · Common Core: NGSS.MS-PS4-1, NGSS.4-PS4-1, NGSS.MS-PS4-2 · England: KS3 Physics: Waves (observed waves), KS4 Combined Science: Waves in matter, KS3 Physics: Waves (sound)

Name

Date

Score/ 16

  1. Question 1

    A guitar string vibrates 400 times in 4 seconds. What is the frequency of the sound, in hertz (Hz)?

    AnswerHz

  2. Question 2

    How does an image in a flat mirror compare with the object?

    • A. the same in every way
    • B. larger and upright
    • C. same size, upright and laterally inverted (left–right swapped)
    • D. smaller and upside down

  3. Question 3

    Is this a transverse or a longitudinal wave: sound in air?

    • A. transverse
    • B. longitudinal

  4. Question 4

    Why can bats hear sounds that people cannot?

    • A. They have bigger amplitude ears
    • B. Sound travels faster for bats
    • C. Bats hear only low frequencies
    • D. Their hearing range extends to much higher frequencies

  5. Question 5

    Humans can hear from about 20 Hz to 20 000 Hz. Could a young person hear a sound of 5 kHz?

    • A. yes
    • B. no, it is ultrasound

  6. Question 6

    16 waves pass a point in 4 seconds. What is the frequency, in hertz (Hz)?

    AnswerHz

  7. Question 7

    A ray of light makes an angle of 60° with the surface of a mirror. What is the angle between the incident ray and the reflected ray, in degrees?

    Answer°

  8. Question 8

    A ray of light hits a flat mirror with an angle of incidence of 70°. What is the angle of reflection, in degrees?

    Answer°

  9. Question 9

    Which part of the wave is marked on the diagram?

    • A. wavelength
    • B. trough
    • C. crest (peak)
    • D. amplitude

  10. Question 10

    A guitar string vibrates 2200 times in 5 seconds. What is the frequency of the sound, in hertz (Hz)?

    AnswerHz

  11. Question 11

    Why can you see your reflection in a mirror but not in a sheet of white paper?

    • A. Paper absorbs all light
    • B. Mirrors make light
    • C. Paper is transparent
    • D. The mirror gives regular (specular) reflection; rough paper scatters light in all directions

  12. Question 12

    Is this a transverse or a longitudinal wave: a slinky (spring) pushed and pulled along its length?

    • A. transverse
    • B. longitudinal

  13. Question 13

    Two sound waves are shown on an oscilloscope. Wave B has taller peaks than wave A but the same spacing. How does B sound?

    • A. higher pitched
    • B. quieter
    • C. lower pitched
    • D. louder, with the same pitch

  14. Question 14

    A dog whistle produces sound at 25 kHz. What is this frequency in Hz? (1 kHz = 1000 Hz)

    AnswerHz

  15. Question 15

    4 waves pass a point in 2 seconds. What is the frequency, in hertz (Hz)?

    AnswerHz

  16. Question 16

    A ray of light makes an angle of 60° with the surface of a mirror. What is the angle between the incident ray and the reflected ray, in degrees?

    Answer°

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  1. 100 Hz
  2. same size, upright and laterally inverted (left–right swapped)
  3. longitudinal
  4. Their hearing range extends to much higher frequencies
  5. yes
  6. 4 Hz
  7. 60 °
  8. 70 °
  9. amplitude
  10. 440 Hz
  11. The mirror gives regular (specular) reflection; rough paper scatters light in all directions
  12. longitudinal
  13. louder, with the same pitch
  14. 25000 Hz
  15. 2 Hz
  16. 60 °