Subscribe

Grade 8 · Science · Unit 4 of 5

Light & Radiation

Waves, the spectrum and how light behaves

What your child practises

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

NWT Curriculum learning standard: Electromagnetic radiation: types and effects; light as a wave and a particle; reflection and refraction

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 colours in a prism?

    • Light changes into sound.
    • Different colours 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 colours.
    • It absorbs red light.
    • It reflects red light and absorbs most other colours.
    • 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

More Grade 8