WONDER #1558: How Do Police Know How Fast You’re Going?

Question 1 of 3

What does radar stand for?

  1. Radio Detection and Ranging
  2. Really Awesome Detector for Auto Racing
  3. Racing Autos Detected and Ranged
  4. Radical Auto Detection and Registration

Question 2 of 3

Lidar machines use what modern technology?

  1. light bulbs
  2. nuclear fission
  3. solar power
  4. lasers

Question 3 of 3

Radar guns detect speed by making calculations based upon what scientific principle?

  1. gravity field
  2. Doppler shift
  3. echolocation
  4. magnification

Check your answers online at https://stage.wonderopolis.org/wonder/how-do-police-know-how-fast-youre-going.