Chapter 11, Problem 3P

Calculate the coherence length for CO2 laser whose line width is 10^−5nm at IR emission wavelength of 10.6 μm.

When x - rays of wavelength of 0.129 nm are incident on the surface of a crystal having a structure similar to that of NaCl, a first - order maximum is observed at 8.15°. Calculate the interplanar spacing of the crystal based on this information.

A hollow cathode lamp has a lambda max of 1252 nm at 2473.15 kelvin. The spectral radiance is 1.86 x 10^10 J/m^3s. If the lamp is enclosed in a quartz envelope with a transmission factor of 0.92, what is the spectral emissivity?

For a coefficient of 1.8 × 10^15 m−1 J^-0.5, at what wavelength is the absorption coefficient equal to 1000 cm-1 for GaAs at 300K.

X-rays with wavelengths of 128 pm was used to study a crystal which produced a reflection of 15.8 degrees. Assuming first order diffraction (n = 1), what is the distance between the planes of atoms (d)?

1. The visible light of wavelength 5000˚A undergoes scattering from a crystal of re￾fractive index 1.5. Calculate the maximum frequency of the phonon generated and the fractional change in the frequency of the incident radiation, given the velocity of sound in the crystal as 5000 m/s. 2. The Young’s modulus of NaCl in [100] direction is 5 × 1010N/m2 . Assuming that the extension in the [100] direction produces negligible contraction in the perpendicular directions, calculate the wavelength at which the electromanetic radiation is strongly reflected by the NaCl crystal. Atomic masses of Na and Cl are 23 and 35.5 a.m.u respectively.3. Gold has the structure as copper. The velocity of sound in gold is 2100 m/s and that in copper is 3800 m/s. If the Debye temperature of copper is 348 K, determine the Debye temperature of gold. The densities of gold and copper are 1.93 × 104kg/m3 and 8960kg/m3 and their atomic weights are 197.0 and 63.54 a.m.u respectively. 4. The Debye temperature of…

The operating temperature of an indirectly heated filament of a vacuum tube is around 1050K. At what wavelength will it radiate maximum? Given b=0.288cm K.

What is the energy of an ultraviolet photon with wave- length 139 nm?

A crystal sample of bacteriorhodpsin, a light-sensitive protein found in halobacteria that responds to light energy, has crystal planes separated by 0.20 nm. If a beam of 11 keV x rays illuminates a sample, what angles will give diffraction maxima?