X-Ray Fluorescence Spectrometry Questions and Answers

1. If the absorption of electromagnetic radiation by matter results in the emission of radiation of same or longer wavelengths for a long or a short time, the phenomenon is termed as which of the following?

a) Luminescence

b) Fluorescence

c) Phosphorescence

d) Spontaneous emission

Answer: a

2. If the absorption of electromagnetic radiation by matter results in the emission of radiation of same or longer wavelengths for a short time, the phenomenon is termed as which of the following?

a) Luminescence

b) Fluorescence

c) Phosphorescence

d) Spontaneous emission

Answer: b

3. If the absorption of electromagnetic radiation by matter results in the emission of radiation of same or longer wavelengths for a long time, the phenomenon is termed as which of the following?

a) Luminescence

b) Fluorescence

c) Phosphorescence

d) Spontaneous emission

Answer: c

4. Prompt emission of X-ray by an atom ionised by a higher energy X-ray is a type of which of the following phenomena?

a) Luminescence

b) Fluorescence

c) Phosphorescence

d) Spontaneous emission

Answer: b

5. The measurement of intensity of fluorescent X-rays provide a simple and ____________ way of _____________ analysis. Fill in the blanks.

a) Destructive, quantitative

b) Non-destructive, quantitative

c) Destructive, qualitative

d) Non-destructive, qualitative

Answer: b

6. The energy of the emitted X-rays depends upon the _________ of the atom and their intensity depends upon the __________

a) Atomic number, amount of sample

b) Mass number, amount of sample

c) Mass number, concentration of atoms

d) Atomic number, concentration of atoms

Answer: d

7. Which of the following is Mosely’s equation if ‘C’ is the speed of light, ‘a’ is proportionality constant, ‘σ’ is a constant which depends on electronic transition series, ‘Z’ is the atomic number and ‘λ’ is the wavelength?

a) Cλ= a(Z-σ)2

b) C/λ= a(Z-σ)2

c) C(Z-σ)2= aλ

d) C(Z-σ)2= a/λ

Answer: b

8. The problem of spectral interference is not severe in X-ray spectroscopy.

a) True

b) False

Answer: a

9. In X-ray fluorescence spectrometer, the relationship between the excitation intensity and the intensity of fluorescence does not depend on which of the following?

a) Spectrum of the incident radiation

b) Angle of radiance

c) Molecular weight

d) Incident angle

Answer: d

10. Fluorescent X-ray spectrometers would require only moderate-intensity X-ray tubes.

a) True

b) False

Answer: b