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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

    Which part of the wave is marked on the diagram?

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

  2. Question 2

    A ray of light makes an angle of 30° with the surface of a mirror. What is the angle of reflection, in degrees?

    Answer°

  3. Question 3

    Is this a transverse or a longitudinal wave: a wave sent along a rope shaken up and down?

    • A. transverse
    • B. longitudinal

  4. Question 4

    A guitar string vibrates 500 times in 5 seconds. What is the frequency of the sound, in hertz (Hz)?

    AnswerHz

  5. Question 5

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

    AnswerHz

  6. Question 6

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

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

  7. Question 7

    Why can bats hear sounds that people cannot?

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

  8. Question 8

    A ray of light hits a flat mirror with an angle of incidence of 60°. What is the angle of reflection, in degrees?

    Answer°

  9. Question 9

    50 waves pass a point in 5 seconds. What is the frequency, in hertz (Hz)?

    AnswerHz

  10. Question 10

    Which part of the wave is marked on the diagram?

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

  11. Question 11

    A ray of light makes an angle of 25° with the surface of a mirror. What is the angle between the incident ray and the reflected ray, in degrees?

    Answer°

  12. Question 12

    Is this a transverse or a longitudinal wave: a wave sent along a rope shaken up and down?

    • A. transverse
    • B. longitudinal

  13. Question 13

    A guitar string vibrates 220 times in 0.5 seconds. What is the frequency of the sound, in hertz (Hz)?

    AnswerHz

  14. Question 14

    Humans can hear from about 20 Hz to 20 000 Hz. Could a young person hear a sound of 2 kHz?

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

  15. Question 15

    The James Webb Space Telescope uses gold-coated mirrors. Why gold?

    • A. Gold absorbs infrared light
    • B. Gold reflects infrared light very well
    • C. Gold is magnetic
    • D. Gold makes the telescope heavier

  16. Question 16

    Why does the upper limit of hearing often fall as people get older?

    • A. Older people make higher sounds
    • B. The ear canal gets wider
    • C. Sound gets slower
    • D. Sensitive cells in the inner ear are gradually damaged

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Answer key: 6th grade light, sound and waves

  1. 1. B. crest (peak)

  2. 2. 60 °

  3. 3. A. transverse

  4. 4. 100 Hz

  5. 5. 25000 Hz

  6. 6. A. same size, upright and laterally inverted (left–right swapped)

  7. 7. C. Their hearing range extends to much higher frequencies

  8. 8. 60 °

  9. 9. 10 Hz

  10. 10. C. wavelength

  11. 11. 130 °

  12. 12. A. transverse

  13. 13. 440 Hz

  14. 14. A. yes

  15. 15. B. Gold reflects infrared light very well

  16. 16. D. Sensitive cells in the inner ear are gradually damaged