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7th grade light, sound and waves

7th grade (Year 8 in England) · 14 questions · Common Core: NGSS.MS-PS4-1, NGSS.MS-PS4-2 · England: KS3 Physics: Waves (sound waves), KS3 Physics: Waves (light waves), KS4 Combined Science: Light and electromagnetic waves

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Date

Score/ 14

  1. Question 1

    Colour and light: which statement is NOT true?

    • A. Light slows down when it enters glass or water.
    • B. A red filter lets red light through and absorbs other colours.
    • C. A red filter turns white light red by adding red.
    • D. White light is a mixture of colours.

  2. Question 2

    You see lightning and hear the thunder 5 seconds later. Sound travels at about 340 m/s. About how far away is the storm, in metres?

    Answerm

  3. Question 3

    You shout towards a cliff and hear the echo 2 s later. Sound travels at 340 m/s. How far away is the cliff, in metres?

    Answerm

  4. Question 4

    What is ultrasound?

    • A. sound that travels in a vacuum
    • B. sound with a frequency too high for humans to hear
    • C. light we cannot see
    • D. very loud sound

  5. Question 5

    Sound travels at about 340 m/s in air. How far does it travel in 3 s, in m?

    Answerm

  6. Question 6

    What colour does a white T-shirt look under only red light?

    • A. white
    • B. red
    • C. green
    • D. blue

  7. Question 7

    In which direction do air particles vibrate when a sound wave passes?

    • A. backwards and forwards, parallel to the direction the sound travels
    • B. up and down, at right angles to the wave
    • C. in circles
    • D. they do not move

  8. Question 8

    How sound travels: which statement is NOT true?

    • A. In a sound wave, air particles travel all the way from the source to your ear.
    • B. Sound waves are longitudinal.
    • C. Sound cannot travel through a vacuum.
    • D. Whales can communicate over long distances underwater.

  9. Question 9

    Colour and light: which statement is NOT true?

    • A. A red filter lets red light through and absorbs other colours.
    • B. Light slows down when it enters glass or water.
    • C. Light travels at the same speed in glass as in air.
    • D. White light is a mixture of colours.

  10. Question 10

    You see lightning and hear the thunder 6 seconds later. Sound travels at about 340 m/s. About how far away is the storm, in metres?

    Answerm

  11. Question 11

    You shout towards a cliff and hear the echo 3 s later. Sound travels at 340 m/s. How far away is the cliff, in metres?

    Answerm

  12. Question 12

    Why do you see lightning before you hear thunder?

    • A. Sound travels faster than light
    • B. Your eyes are faster than your ears
    • C. Thunder is made later
    • D. Light travels much faster than sound

  13. Question 13

    Sound travels at about 5000 m/s in steel. How far does it travel in 2 s, in m?

    Answerm

  14. Question 14

    What colour does a white T-shirt look under only red light?

    • A. green
    • B. white
    • C. blue
    • D. red

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Answer key: 7th grade light, sound and waves

  1. 1. C. A red filter turns white light red by adding red.

  2. 2. 1700 m

  3. 3. 340 m

  4. 4. B. sound with a frequency too high for humans to hear

  5. 5. 1020 m

  6. 6. B. red

  7. 7. A. backwards and forwards, parallel to the direction the sound travels

  8. 8. A. In a sound wave, air particles travel all the way from the source to your ear.

  9. 9. C. Light travels at the same speed in glass as in air.

  10. 10. 2040 m

  11. 11. 510 m

  12. 12. D. Light travels much faster than sound

  13. 13. 10000 m

  14. 14. D. red