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...Energy levels are demonstrated in the context of a sodium lamp in Video 3. Watch it now and then do Activity 4. HELEN: So in the last experiment, we absolutely established that light can behave as a wave, but now we're going to show you something that shows that also lights can behave as a particle. So here I have an experiment which actually OU students get a chance to...

...energy efficient. Due to the high capital cost of machines and dies, the process is only suitable for long production runs. Materials: Thermopolymers are the most commonly used materials although the process is being increasingly used on thermosets (such as polyesters and melamines), rubbers, reinforced polymers (glass and carbon fibre) and to produce both structural and...