Physics Grade 6-8

Physics: Waves: Sound and Light Properties

Comparing how sound and light waves travel, reflect, refract, and carry energy

View Answer Key
Name:
Date:
Score: / 15

Comparing how sound and light waves travel, reflect, refract, and carry energy

Physics - Grade 6-8

Instructions: Read each problem carefully. Use complete sentences when explaining your reasoning. Show calculations when numbers are given.
  1. 1
    Sound vibrations travel from a tapped metal desk through air to a student's ear.

    A student taps a metal desk and hears a sound. Explain how the sound travels from the desk to the student's ear.

  2. 2
    Light travels from the Sun to Earth, while sound waves fade in empty space.

    Light from the Sun can reach Earth through space, but sound from the Sun cannot. Explain why.

  3. 3
    Two waves with the same frequency but different amplitudes.

    Two sound waves are shown. Wave A has a larger amplitude than Wave B, but both have the same frequency. Which sound is louder, and why?

  4. 4
    A flute produces closely spaced waves, while a tuba produces wider spaced waves.

    A flute plays a note with a high pitch. A tuba plays a note with a low pitch. Compare the frequencies of the two sounds.

  5. 5

    A wave has a frequency of 5 hertz and a wavelength of 2 meters. Use the formula speed = frequency × wavelength to find the wave speed.

  6. 6

    A sound wave travels through air at about 340 meters per second. If the sound has a frequency of 170 hertz, what is its wavelength? Use wavelength = speed ÷ frequency.

  7. 7
    A flashlight beam reflects off a mirror at an angle.

    A student shines a flashlight at a mirror. The beam bounces off the mirror. Identify the wave behavior and describe what happens.

  8. 8
    A pencil appears bent in water because light bends at the surface.

    A pencil looks bent when it is placed in a glass of water. Identify the wave behavior that causes this effect and explain it.

  9. 9
    A black shirt absorbs more sunlight while a white shirt reflects more sunlight.

    A black shirt feels warmer than a white shirt in bright sunlight. Use wave properties to explain why.

  10. 10
    Clear glass lets light through, wax paper scatters light, and wood blocks light.

    Classify each material as mostly transparent, translucent, or opaque: clear window glass, wax paper, and a wooden door.

  11. 11
    Sound waves from a clap reflect off a gym wall and return as an echo.

    A teacher claps once in a gym and hears the sound repeat a moment later. What is this repeated sound called, and what causes it?

  12. 12
    Violet light has shorter waves than green, and red has longer waves.

    Visible light is part of the electromagnetic spectrum. Arrange these colors from shortest wavelength to longest wavelength: red, violet, green.

  13. 13
    Sound waves bunch up in front of a moving ambulance and spread out behind it.

    A siren seems higher-pitched as an ambulance moves toward you and lower-pitched as it moves away. Name this effect and explain what changes.

  14. 14
    Louder and quieter sounds have different amplitudes but travel through the same air.

    A student says, 'A louder sound must be traveling faster than a quieter sound in the same room.' Explain whether the student is correct.

  15. 15
    Sound is shown moving through particles, while light is shown traveling through empty space.

    Compare sound waves and light waves by listing one way they are similar and one way they are different.

LivePhysics™.com Physics - Grade 6-8

More Physics Worksheets

See all Physics worksheets

More Grade 6-8 Worksheets

See all Grade 6-8 worksheets