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://wonderopolis.org/index.php/wonder/how-do-police-know-how-fast-youre-going.