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Exercise

"Everyone is wise until he speaks."
- (Proverb)
1. 

A certain fiber-optic cable has the following characteristics: n1 = 1.82 and n2 = 1.73. What is the value of θc?

A. 71.90ºB. 0.95º
C. 18.1ºD. 1.81º

2. 

An AM demodulator can be implemented with a linear multiplier followed by a ________ filter.

A. low-passB. high-pass
C. band-passD. band-stop

3. 

The intermediate frequency in a standard AM receiver is

A. 455 Hz.
B. 455 kHz.
C. 4.55 MHz.
D. none of the above

4. 

In order for a light ray to propagate along a fiber-optic cable, what must the relationship be between the angle of incidence and the critical angle?

A. θi > θc
B. θi < θc
C. θi = θc
D. none of the above

5. 

Light may be propagated along a fiber-optic cable in which of the following modes?

A. multimode step index
B. single-mode step index
C. multimode graded index
D. all of the above




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