When the refractive index $$\mu $$ of the active medium changes by $${\Delta \mu }$$ in a laser resonator of length L, the change in the spectral spacing between the longitudinal modes of the laser is (c is the speed of light in free space)
A. $$\frac{c}{{2\left( {\mu + \Delta \mu } \right)L}}$$
B. $$\frac{c}{{2\Delta \mu L}}$$
C. $$\frac{c}{{2L}}\frac{{\Delta \mu }}{{\mu \left( {\mu + \Delta \mu } \right)}}$$
D. zero
Answer: Option C
This Question Belongs to Engineering Physics >> Atomic And Molecular Physics
All vibrations producing a change in the electric dipole moment of a molecule yield
A. Raman spectra
B. Infrared spectra
C. Ultra-violet spectra
D. X-ray spectra
A. $$\frac{{3{g_1}e{H_0}}}{{2\pi {m_p}}}$$
B. $$\frac{{3{g_1}e{H_0}}}{{4\pi {m_p}}}$$
C. $$\frac{{{g_1}e{H_0}}}{{2\pi {m_p}}}$$
D. $$\frac{{{g_1}e{H_0}}}{{4\pi {m_p}}}$$
A. P and Q
B. P, R and T
C. P, S and T
D. Q and R
The hyperfine structure of Na(32P3/2) with nuclear $$l$$ = 3/2 has
A. 1 state
B. 2 states
C. 3 states
D. 4 states
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