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Q1. A semiconductor laser crystal of length 5 cm, refractive index 1.8 is used as an optical source. Determine the frequency separation of the modes.

(a) 2.8 GHz
(b) 1.2 GHz
(c) 1.6 GHz
(d) 2 GHz

Q2. A ruby laser has a crystal of length 3 cm with a refractive index of 1.60, wavelength 0.43 ?m. Determine the number of longitudinal modes.

(a) 1?102
(b) 3?106
(c) 2.9?105
(d) 2.2?105

Q3. __________________ in the laser occurs when photon colliding with an excited atom causes the stimulated emission of a second photon.

(a) Light amplification
(b) Attenuation
(c) Dispersion
(d) Population inversion

Q4. The lower energy level contains more atoms than upper level under the conditions of ________________

(a) Isothermal packaging
(b) Population inversion
(c) Thermal equilibrium
(d) Pumping

Q5. An incandescent lamp is operating at a temperature of 1000K at an operating frequency of 5.2?1014 Hz. Calculate the ratio of stimulated emission rate to spontaneous emission rate.

(a) 3?10-13
(b) 1.47?10-11
(c) 2?10-12
(d) 1.5?10-13

Q6. Which process gives the laser its special properties as an optical source?

(a) Dispersion
(b) Stimulated absorption
(c) Spontaneous emission
(d) Stimulated emission

Q7. The radiation emission process (emission of a proton at frequency) can occur in __________ ways.

(a) Two
(b) Three
(c) Four
(d) One

Q8. The frequency of the absorbed or emitted radiation is related to difference in energy E between the higher energy state E2 and the lower energy state E1. State what h stands for in the given equation?

(a) Gravitation constant
(b) Planck?s constant
(c) Permittivity
(d) Attenuation constant

Q9. How many types of sources of optical light are available?

(a) One
(b) Two
(c) Three
(d) Four

Q10. A device which converts electrical energy in the form of a current into optical energy is called as ___________

(a) Optical source
(b) Optical coupler
(c) Optical isolator
(d) Circulator


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354 views

On Bombarding 7N14 With α - Particles, The Nuclei Of The Product Formed After The Release Of A Proton Will Be

Modified 229 Year Ago

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229 Year Ago

On Bombarding 7N14 With α - Particles, The Nuclei Of The Product Formed After The Release Of A Proton Will Be

0 votes
0 Answer
274 views

β-particle Is Emitted In A Radioactive Reaction When

Modified 4 Year Ago

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4 Year Ago

β-particle Is Emitted In A Radioactive Reaction When

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0 Answer
268 views

The Number Of Beta Particles Emitted In The Radioactive Decay From 238/92 U And 206/82 Pb Is

Modified 4 Year Ago

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4 Year Ago

The Number Of Beta Particles Emitted In The Radioactive Decay From 238/92 U And 206/82 Pb Is

0 votes
0 Answer
266 views

When Any Radioactive Element Emits B-particle Some Product Is Obtained. They Both Are

Modified 4 Year Ago

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4 Year Ago

When Any Radioactive Element Emits B-particle Some Product Is Obtained. They Both Are

0 votes
0 Answer
264 views

A Position Is Emitted From 23/11 Na. The Ratio Of The Atomic Mass And Atomic Number Of The Resulting Nuclide Is

Modified 4 Year Ago Neysa

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Neysa
4 Year Ago

A Position Is Emitted From 23/11 Na. The Ratio Of The Atomic Mass And Atomic Number Of The Resulting Nuclide Is

0 votes
0 Answer
257 views

Which Of The Following Nuclear Transformation Is (n, P) Type

Modified 229 Year Ago Ankush Sharma

257
Ankush Sharma
229 Year Ago

Which Of The Following Nuclear Transformation Is (n, P) Type

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