Physics 3 Quiz 0.0 / 5 ? PhysicsAllGCSEWJEC Created by: Michka139Created on: 11-03-16 18:20 Define transverse waves Vibrations are at 90 degrees to the direction of wave motion 1 of 7 Define longitudinal waves Vibrations are parallel to direction of wave motion 2 of 7 When a light ay enters a glass block why does it change direction? The light ray slows down- it is refracted 3 of 7 Why is voltage induced when a wire is moved through a magnetic field? Field lines are being cut 4 of 7 In a generator why is the induced current a.c? Coil cuts field lines in one direction, then half a turn later in the opposite direction 5 of 7 How do stars produce energy? Nuclear fusion of hydrogen 6 of 7 According to the Big Bang Theory,what is the composition of the universe? Hydrogen ( approx 75%) and helium ( approx 25%) and small quantities of light elements 7 of 7
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