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Grade 11 · Science · Physics

11th grade How devices use waves to send and capture information and energy worksheet

6 printable versionsChallenge Me10 questions · answer keyFree · no account

Level: Building Confidence · On Level · Challenge Me

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How devices use waves to send and capture information and energy

Grade 11 Science Worksheet - Challenge Me

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Circle the best answer, or write your answer on the line.

  1. Quartz glass has n = 1.46 (Engineering ToolBox). For light inside it meeting air (n = 1.00), what is the critical angle, to 0.01°, Ari?

  2. Water has n = 1.333 (Engineering ToolBox). For light inside it meeting air (n = 1.00), what is the critical angle, to 0.01°, Bo?

  3. Diamond has n = 2.417 (Engineering ToolBox). For light inside it meeting air (n = 1.00), what is the critical angle, to 0.01°, Esme?

  4. Why does light stay inside a fiber-optic cable as it bends, Jun?

    • The glass soaks up the light and glows
    • Total internal reflection at the edge
    • The light slows to a stop

  5. How must the cladding around a fiber's core compare with the core, Kira?

    • It has a higher refractive index
    • It must be made of metal
    • It has a lower refractive index

  6. A fiber is bent so sharply that light meets the edge at less than the critical angle. What happens, Luz?

    • The light speeds up
    • More light is trapped
    • Some light escapes

  7. Why do ultrasound scanners use millions of vibrations per second, Milo?

    • High pitches are louder
    • Low pitches can't enter gel
    • Short waves show fine detail

  8. A router offers 2.4 GHz and 5 GHz. Which usually reaches farther through walls, Pia?

    • Both reach equally far
    • 2.4 GHz, with its longer waves
    • 5 GHz, since it is faster

  9. Ren says ultrasound scanners use X-rays. Agree or disagree?

    • Agree: they use very weak X-rays
    • Agree: echoes are X-rays
    • Disagree: they use sound waves

  10. Tala says a solar panel turns all the sunlight it gets into electricity. Agree or disagree?

    • Disagree: much becomes heat
    • Agree: sunlight is pure electricity
    • Agree: panels waste no energy
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11th grade How devices use waves to send and capture information and energy worksheet – printable
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About this worksheet

How devices use waves to send and capture information and energy. Every version has 10 questions, and the answer key prints on the second page.

What your child will learn

  • I can say which wave a device uses: phones and Wi-Fi use radio, fiber uses light, remotes use infrared, and ultrasound uses sound.
  • I can find a radio wavelength from λ = c ÷ f, and an echo depth from speed × time ÷ 2.
  • I can explain how solar cells turn light into electricity and find a panel's power from efficiency × 1000 W/m² × area.
  • I can explain how fiber optics trap light by total internal reflection and find a critical angle from sin θc = n₂ ÷ n₁.

Standard: HS-PS4-5

Words to know

antenna: The part of a device that sends or receives radio waves

echo: A wave reflected back from a boundary

efficiency: The fraction of input energy turned into useful output

critical angle: The angle past which light reflects totally instead of leaving

cladding: The glass layer around a fiber's core, with a lower refractive index

Common mistakes

Your child multiplied. Wavelength is speed ÷ frequency: a higher frequency gives a shorter wave.

Your child forgot to halve the time. The pulse goes down and back, so the depth is speed × time ÷ 2.

Your child used cosine. The critical angle is where sin θc = n₂ ÷ n₁, measured from the normal.

Questions parents ask

What is the most common mistake with how devices use waves to send and capture information and energy?

Your child multiplied. Wavelength is speed ÷ frequency: a higher frequency gives a shorter wave.

Are these 11th grade science worksheets free to print?

Yes. All 6 printable versions at each level are free to print, with the answer key, and no account is needed.

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