Question

In: Electrical Engineering

1.    When measuring infrared area reflectivity, what is used as a reference material? a.      Gold b.     Steel c.      Silicon d.   &

1.    When measuring infrared area reflectivity, what is used as a reference material?

a.      Gold

b.     Steel

c.      Silicon

d.     Tungsten

2.    What is true about the light source for photoelectron spectroscopy?

a.      Hit a pure metal with an accelerated electron, resulting in a single-energy X-ray.

b.     The energy of the UV light represents almost constant energy regardless of the discharge gas.

c.      The use of radiation accelerators allows the use of light from various energies.

d.     Monochromator can increase light intensity.

3.    Which of the following statements is incorrect?

a.    Initial state effect is the effect produced by coupling with other atoms/ion.

b.    The initial state effect can be observed to distinguish the chemical species of the specimen.

c.    The Final State effect is the effect caused by the perturbation of the electronic structure by photomultiplier emission.

d.    The Final State effect increases the complexity of the spectra without the information of the samples, causing confusion in the analysis.

4.    Which of the following types of semiconductor-to-semiconductor bonding is advantageous to properly separate the exciton produced after light absorption from the light detector or solar cell?

a.    TYPE I

b.    TYPE II

c.    TYPE III

d.    Not relevant to junction TYPE

5.    What are the advantages of low temperature elliptical spectroscopy?

a.    You can separate overlaid transition points.

b.    Analyze the transition point.

c.    Measure the thickness of the thin film with an accuracy of less than nm.

d.    Accurately measure the level of a valence band

6.    Which of the following statements about XPS, UPS, or IPES is incorrect?

a.    The electronics of valence band cannot be measured with XPS, but must be measured with UPS.

b.    XPS and UPS cannot measure empty electronic structures.

c.    XPS and UPS have the same principle or different energy sources.

d.    IPES measures the energy of photons emitted when electrons are added to a sample.

7.    If the refractive index of the medium between the lens and the focal point is n, and the radius of the lens and the angle between the focal point is a, how is the numerical approach calculated?

a.    n x sina

b.   n x cosa

c.    n x tana

d.   n x cota

8.    A peak appeared in the Photoluminescence spectrum of a direct-gap bulk semiconductor. Which of the following is true?

a.    Band-gap energy is greater than peak energy.

b.   Band-gap energy is smaller than peak energy.

c.    Band-gap energy is the addition of ponon energy to peak energy.

d.   Band-gap energy is the energy of the peak minus the ponon energy.

9.    Which of the following statements is incorrect?

a.    Information on the direction of growth of the crystal structure can be obtained through the Raman spectrometry.

b.    Selection rules for vibration mode are always the opposite in IR spectroscopy and Raman spectroscopy.

c.    In general, the Raman analysis should analyze the light of wavelengths close to incident lasers compared to the luminescence.

d.    Both luminescence (PL) and Raman can be investigated for polarizing dependencies to obtain additional information.

10. Metal reflects most of the terahertz wave, so the transmittance is very low. Why do metals show high reflectivity in the Terahertz area?

a.    electromagnetic reaction of free electron

b.    electromagnetic response of grid oscillation

c.    interband transition phenomenon

d.    various defects in metal

11. Which of the following is the most suitable roadband light source in the range of 300 nm to 700 nm?

a.    Tungsten halogen lamp

b.    Xenon lamp

c.    Mercury lamp

d.    Supercontinuum laser

12. Which dispersion relationship is not suitable for expressing a genetic function with band gaps?

a.    Dielectric function parametric model

b.    Tauc-Lorentz model

c.    Gaussian equation

d.    Lorentz model

13. What is the wavelength area of the medium infrared radiation?

a.    0.1 mm - 10 mm

b.    300μm - 20μm

c.    20μm - 2μm

d.    2μm - 700 nm

14. Which of the following statements is true about Raman Spectrum and the vibration mode of matter?

a.    The Raman Shift value corresponds to the frequency or energy of the vibration mode.

b.    The peak corresponding to all vibration modes appears in the Raman Spectrum.

c.    The strength of each peak in the Raman spectrum is proportional to the crystallinity of the material.

d.    The amorphous material does not produce a Raman signal.

15. What is the energy of a porton with a wavelength of 550 nm?

a.    2.0 eV

b.    2.1 eV

c.    2.2 eV

d.    2.3 eV

16. GaAs were measured with Modulation Spectroscopy. Which of the following statements is incorrect?

a.    The band gap can also be accurately measured at room temperature.

b.    Spin-orbit splitting can be measured.

c.    You can directly measure the curvature of the conditioning band near the point.

d.    Transitions not distinct from the Reflectance spectrum can also be measured.

17. Which of the following is NOT an advantage of terrahertz time-degradation spectrophotometry?

a.    Measurements can be made in a relatively short period of time.

b.    Sensitivity increases because no spectroscopic measurement is performed by dividing energy by frequency.

c.    Because amplitude and phase are determined at the same time, optical constants can be derived without any additional assumptions.

d.    General light sources provide easy access to visible light and ultraviolet areas.

18. When light of linear polarizing is injected into a specimen with a complex dielectric rate, what polarizing is the reflected light generally?

a.    linear polarization

b.    elliptic polarography

c.    circular polarization

d.    rotating polariza

19. Which of the following statements is incorrect?

a.    Initial state effect is the effect produced by coupling with other atoms/ion.

b.     The initial state effect can be observed to distinguish the chemical species of the specimen.

c.    The Final State effect is the effect caused by the perturbation of the electronic structure by photomultiplier emission.

d.    The Final State effect increases the complexity of the spectra without the information of the samples, causing confusion in the analysis.

20. What is NOT a measurement for correct elliptical spectroscopy?

a. Increase the measurement variable by measuring the angle of incidence of multiple angles.

b. Measure only narrow wavelength areas suitable for analysis purposes.

c. Calibration of the optical components must be performed before measuring samples.

d. Prepare a clean sample with a mirror-like.

Solutions

Expert Solution

1.    When measuring infrared area reflectivity, what is used as a reference material?

OPTION (A) Gold

2. What is true about the light source for photoelectron spectroscopy?

Option C The use of radiation accelerators allows the use of light from various energies.

3.    Which of the following statements is incorrect?

Optiom B The initial state effect can be observed to distinguish the chemical species of the specimen.

4.    Which of the following types of semiconductor-to-semiconductor bonding is advantageous to properly separate the exciton produced after light absorption from the light detector or solar cell?

b.    TYPE II

5.    What are the advantages of low temperature elliptical spectroscopy?

c.    Measure the thickness of the thin film with an accuracy of less than nm.

b6.    Which of the following statements about XPS, UPS, or IPES is incorrect?

a.    The electronics of valence band cannot be measured with XPS, but must be measured with UPS.

7.    If the refractive index of the medium between the lens and the focal point is n, and the radius of the lens and the angle between the focal point is a, how is the numerical approach calculated?

a.    n x sina

8.    A peak appeared in the Photoluminescence spectrum of a direct-gap bulk semiconductor. Which of the following is true?

a.    Band-gap energy is greater than peak energy.

9.    Which of the following statements is incorrect?

b.    Selection rules for vibration mode are always the opposite in IR spectroscopy and Raman spectroscopy.

10. Metal reflects most of the terahertz wave, so the transmittance is very low. Why do metals show high reflectivity in the Terahertz area?

b.    electromagnetic response of grid oscillation

11. Which of the following is the most suitable roadband light source in the range of 300 nm to 700 nm?

c.    Mercury lamp

12. Which dispersion relationship is not suitable for expressing a genetic function with band gaps?

a.    Dielectric function parametric model

13. What is the wavelength area of the medium infrared radiation?

b.    300μm - 20μm

14. Which of the following statements is true about Raman Spectrum and the vibration mode of matter?

c.    The strength of each peak in the Raman spectrum is proportional to the crystallinity of the material.

15. What is the energy of a porton with a wavelength of 550 nm?

d.    2.3 eV

16. GaAs were measured with Modulation Spectroscopy. Which of the following statements is incorrect?

C.    You can directly measure the curvature of the conditioning band near the point.

17. Which of the following is NOT an advantage of terrahertz time-degradation spectrophotometry?

c.    Because amplitude and phase are determined at the same time, optical constants can be derived without any additional assumptions.

18. When light of linear polarizing is injected into a specimen with a complex dielectric rate, what polarizing is the reflected light generally?

b.    elliptic polarography

19. Which of the following states is incorrect?

b.     The initial state effect can be observed to distinguish the chemical species of the specimen.

20. What is NOT a measurement for correct elliptical spectroscopy?

b. Measure only narrow wavelength areas suitable for analysis purposes.

Manojponduru answered 7 months ago
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