E.M. spectrum

Today we're going to summarise the E.M. spectrum work we've been doing so we're ready for next term. Answer the following in your books:

1. What are fibre-optic cables? What are they made form and what energy do they transmit?
2. What dangers have been linked to mobile phones and the electromagnetic spectrum? What have scientistts found?
3. Use the diagram below to explain which visible colour has the longest wavelength:                              
4. What is the Doppler effect?
5. Use the video below to describe how sound and light are both influenced by the Doppler effect:


6. Who used evidence from other galaxies to come up with the Big Bang theory? Briefly describe what the theory states:
7. Use the information above to explain why some of the galaxies in this picture appear red. Why are some more red than others?                                                                     
8. If redshift is one piece of evidence for the big bang theory, what is the other main piece of evidence that supports the Big Bang theory?
9. Try this activity.
10. Extension - Read about the theories regarding a big crunch or big yawn (click on 'the big bang' in the index and then scroll down). Briefly describe what each one states.