The Way Science Works 104-1 Final Examination Hints

1. Describe the general working principle of an amplifier, and give two examples.

2. Why blue skin or hair mammals are extremely rare on earth surface (land).

3. What are the primary colours of light, pigment and the complementary colour of red ?

4. Why people can not see clearly in water even wearing eye glasses they wear daily.

5. How does a loud speaker work ?

6. What are the advantages of using a Number System ?

7. Describe the relation between aperture size and depth of photographs. Draw picture to show how an image form in a pin-hole camera.

8. What do communication optics fiber and jewelry diamond have in common ?

9. Both TV and Radio Tuners have LC circuits , give the name of phenomenon that makes the selection of particular station/channel frequency possible.

10. A radio receiver is not a computer, why does it need some transistors installed ?

11. Why the read/write head of a DVD Drive always requires laser light source instead of LED or light bulb.

12. What is the difference between FM and AM radio ?

8. How does a CCD (Charged Coupled Device) work ?

13. light tavel faster in high density or low density materials ?

14. Write-once DVD-R and erasable DVD-RW are different in working principles, describe such difference.

15. Describe in detail the procedure of DVD stamp-pressing production method.

16. What is ionosphere and what has that to do with radio broadcasting ?