Which of the areas above do you find the toughest?
The electromagnetic spectrum (all aspects)
Properties of a wave
Black body radiation
Concave and convex lenses
Refraction
Transverse and longitudinal waves
Sound
Reflection
Uses of waves in imaging (e.g. sonar)
Colour
Emission and absorption of infra-red radiation
Wave speed equation
Select up to 3 answers.
Vote
View Results
See this poll on:
https://poll.fm/9814394/embed