Fluorescence Spectroscopy and Infrared Spectroscopy

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What is the principle of Raman spectroscopy?

Measuring the absorption of light by molecules
Measuring the transmission of light through molecules
Measuring the emission of light by molecules
Measuring the vibrational energy modes of molecules through scattered light (correct)

In which region of the spectrum is Infrared Spectroscopy typically performed?

Ultraviolet region
Gamma-ray region
X-ray region
Visible and Near-Infrared region (correct)

What is the type of spectroscopy that exploits the fluorescence effect?

Nuclear Magnetic Resonance Spectroscopy
Infrared Spectroscopy
Fluorescence Spectroscopy (correct)
Raman Spectroscopy

What is the purpose of optical fibers or integrating spheres in spectrophotometers?

To put the samples in contact with the spectrophotometer (B) Signup and view all the answers

What is the general principle of spectroscopy?

Measuring the absorbance of the sample (A) Signup and view all the answers

What is the type of spectroscopy that is not mentioned in the text?

Impedance Spectroscopy (C) Signup and view all the answers

What type of sensor arrays monitor the process of chemical bonds creation?

Colorimetric (C) Signup and view all the answers

What is the principle behind impedance spectroscopy?

Evaluating the impedance Z from Ohm's law (C) Signup and view all the answers

What is the effect of the creation of chemical bonds on the substances in colorimetric sensor arrays?

Shift the absorption peak in the visible range (A) Signup and view all the answers

What is the main purpose of applying a magnetic field in NMR spectroscopy?

To excite the nuclei into resonance (B) Signup and view all the answers

What is the physical effect related to the presence of fluorophores in food samples?

Fluorescence (D) Signup and view all the answers

What is the main difference between colorimetric sensor arrays and colorimetric systems?

The subject of the investigation (C) Signup and view all the answers

What is the advantage of dielectric techniques in the radio frequency range?

They are fast and non-invasive (C) Signup and view all the answers

Which of the following spectroscopic techniques is used to detect microbial growth and spoilage?

Hyperspectral imaging (A) Signup and view all the answers

What is the purpose of using an array of different dyes in colorimetric sensor arrays?

To monitor several chemical substances at the same time (D) Signup and view all the answers

What is the range of electromagnetic waves used in optical spectroscopic techniques?

UV, VIS, and IR ranges (C) Signup and view all the answers

What is the focus of colorimetric systems in analyzing the samples?

Changes in the whole sample (C) Signup and view all the answers

Which of the following spectroscopic techniques is used to analyze the molecular structure of food samples?

Infrared spectroscopy (D) Signup and view all the answers