Engineering Physics II Practice Test 5

1. In which region of the electromagnetic spectrum, does the semiconductor laser lies?

2. What is the relationship between B₂₁ and B₁₂?

3. Which of the following shows the laser transition in Neon in He-Ne laser?

4. The frequency of incident photon so that the atom makes a transition from E₁ to E₂ should be __________

5. What is the wavelength of the emitted laser by a carbon dioxide?

6. He-Ne laser is a type of ____________

7. Which of the following Einstein’s coefficient represents spontaneous emission?

8. Which Einstein’s coefficient should be used in this case?

9. The output of a laser has pulse duration of 20 ms and average output power of 1.75 W per pulse. How much energy is released per pulse if wavelength is 5890 Å?

10. What will be the relative population of atoms in a ruby layer that produces a light beam of wavelength 6943 Å at 300 K.