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8th grade · Science · Unit 4 of 8

Light & Radiation

Waves, the spectrum and how light behaves

What your child practices

Wavelength and frequency, the electromagnetic spectrum from radio waves to gamma rays and what each is used for, reflection, refraction and color, and staying safe from UV radiation.

Oregon State Standards learning standard: 8.PS4.1; 8.PS4.2 · wave properties and how light reflects, refracts and is absorbed

Sample questions

A taste of this unit. In the app, questions change every time and get easier or harder to match your child.

  1. Question 1

    Which type of radiation is used to take images of bones?

    • infrared
    • microwaves
    • radio waves
    • X-rays

  2. Question 2

    Why do we see white light split into colors in a prism?

    • Light changes into sound.
    • Different colors bend by different amounts when they refract.
    • The prism makes new light.
    • The prism adds paint.

  3. Question 3

    Why is a red shirt red?

    • It reflects all colors.
    • It absorbs red light.
    • It reflects red light and absorbs most other colors.
    • It makes red light.

  4. Question 4

    Put these types of electromagnetic radiation in order from the longest wavelength to the shortest.

    • 🌈Visible light
    • ☀️Ultraviolet
    • 🍿Microwaves
    • 🌡️Infrared

  5. Question 5

    Longer or shorter wavelength than visible light? Sort each radiation.

    Sort into: 〰️ Longer than visible light · ⚡ Shorter than visible light

    • ☢️gamma rays
    • 🪫UV from a tanning lamp
    • ☀️ultraviolet
    • 📶Wi-Fi signals
    • 🩻X-rays
    • 🍿microwaves
    • 📻radio waves
    • 🌡️infrared

  6. Question 6

    Sound needs matter to travel. Light…

    • cannot travel through space
    • needs air
    • needs water
    • can travel through empty space

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