Question

What's the energy of a photon with frequency of 317 Hz? –19

A. 1.62 × 10 W –19

B. 2.88 × 10 W –19

C. 1.36 × 10 W –19

D. 2.10 × 10 W

2. You need to splice two fibers. The transmitting core has a diameter of 75 μm, and the receiving core has a diameter of 62.5 μm. Calculate the power loss due to core diameter mismatch in dB.

A. 3.06 dB

B. 3.57 dB

C. 1.25 dB

D. 2 dB

3. An optical fiber has a bandwidth of 1,600 MHz and a length of 1.5 km. What's its bandwidth-length product?

A. 2,400 MHz-km

B. 1,067 MHz-km

C. 2,000 MHz-km

D. 1,600 MHz-km

4. What method did Alexander Graham Bell use to produce a sound wave with his photophone?

A. Refraction

B. Total internal reflection

C. Modulation

D. Reflection

5. After passing through an amplifier, a signal has 794 percent of its original power. What's the gain expressed in dB?

A. 7.94 dB

B. 8.5 dB

C. 2.1 dB

D. 9 dB

Answer 1

1. Energy of photon (E)= hef -34 whore, he Planck's Coolant = 6.626x10 and f = frequency -34 E = 6.626 x 10 X 317 -31 2.10 x 10 Late Toule mf-kg/S 2 . 21 Grievem- Tstaneme king cooee diameter (Dr)= 75lem Receiving (DR) = 62.5lon i care doamnelor mistratch loss [dB] E-lo log'll DR Erlo log/62. logl6.2.5. = 1:58 dB 3. Ceren - Banduidth = 1600 MHz, Length = 1.5 km Banduidth-length product = 2400 MHz-kom 4. modulation method were used by waham Bell to produce sound ware with his photophone. 5. Let input signal = Pin ... Dolput signal = 7.94 Pin Now, train [ab] = lo log en Slo log (7.94 p Pin 9 dB