Plenary activity to test student knowledge on any topic, can make it fun by doing girl v boys or right side of room v left side. Good for testing what they have learnt in the lesson.
FULL lessons on the following all on one powerpoint with a mix of interactive/fun plenaries:
-Waves in water
-The electromagnetic spectrum
-Light, infrared, microwaves and radiowaves
-UV waves, Gamma and X rays
-X rays in medicine