Question 1:
Infrared spectrometry is a technique used to measure the absorption or transmission of which type of electromagnetic radiation?
Explanation: The correct answer is C) Infrared radiation. Infrared spectrometry involves the measurement of absorption or transmission of electromagnetic radiation in the infrared region of the spectrum, which includes wavelengths ranging from about 700 nanometers (nm) to 1 millimeter (mm). This technique is commonly used in various fields, including chemistry, biology, and materials science.
Question 2:
What is the principle behind infrared spectrometry?
Explanation: The correct answer is C) Absorption of light. Infrared spectrometry is based on the principle that molecules absorb specific frequencies of infrared light, causing the vibrational and rotational energy levels of the molecules to change. By measuring the extent of this absorption, valuable information about the chemical composition and molecular structure of a sample can be obtained.
Question 3:
Which of the following regions of the infrared spectrum is typically used in infrared spectrometry?
Explanation: The correct answer is D) All of the above. Infrared spectrometry utilizes different regions of the infrared spectrum, including the near-infrared (NIR), mid-infrared (MIR), and far-infrared (FIR) regions. Each region provides unique information about the sample, allowing for a comprehensive analysis of its molecular composition and properties.
Question 4:
Which of the following is an advantage of infrared spectrometry?
Explanation: The correct answer is D) It allows non-destructive analysis. One of the advantages of infrared spectrometry is that it allows non-destructive analysis of samples. Infrared radiation is non-ionizing and does not cause chemical changes or damage to the sample, making it possible to study delicate or valuable samples without altering their composition. This characteristic of infrared spectrometry is particularly useful in forensic analysis, art restoration, and other fields.
Question 5:
What is the instrument used to perform infrared spectrometry called?
Explanation: The correct answer is A) Spectrophotometer. A spectrophotometer is the instrument used to perform infrared spectrometry. It consists of a light source, a monochromator or interferometer to select specific wavelengths, a sample holder, and a detector to measure the absorption or transmission of infrared light. The data obtained from the spectrophotometer is then analyzed to generate an infrared spectrum, which provides information about the sample's chemical composition.
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