The way science works : 2016-1 Final Exam

( Answer strictly five questions only, 20 points for each question The sixth answer will be ignored.)

(Sound)

1. High frequency sound could not be produced by large cone-size loudspeaker, explain why.

2. What is the general principle of an amplifier?

(Colour)

3. Spectral color and non-spectral color, give two examples for each.

(Lens)

4. What is the definition of “forming an image”?

5. What are the differences between pin-hole and lensed camera.

6. What is total reflection? When will that happen? Give two examples.

(Computer)

7. What is the advantage of using numbers system (i.e., using numeric letters and digits) ?

8. With some circuits to monitor electrical current and show number, a digital thermometer requires only a single piece of semiconductor has sensor of temperature, why?

(Radio)

9. The effect of “resonance” has appeared twice in our course, what units are those?

10. Radio stations can be selected set to one at each time by adjust the tuner on radio player, what is the principle behind this?

(CCD)

11. Which one is correct? Exposed to stronger (intense) light, (1) more (photo) electrons escape from semiconductor or metallic surfaces, (2) the escaped electrons have higher energy. Who explained this effect?

(DVD)

12. Why is it possible to store so much information onto a DVD disc?