12 Questions
What is the primary focus of forensic instrumentation?
Identifying the chemical composition of matter in forensic cases
Which method provides numerical information about the relative amount of components in a sample?
Quantitative Method
Why is knowledge of measurement principles essential in forensic instrumentation?
For efficient use of measurement tools
During classical methods of analysis, how were components of interest separated from a sample?
Through precipitation, extraction, or distillation
What is the principal purpose of any microscope?
To form an enlarged image of a small object
Which type of microscopy is specifically used for drug identification?
Infrared / IR microscopes
What is the purpose of an Analytical Balance in a forensic instrumentation lab?
To measure the mass of an object with extreme accuracy
What is the difference between accuracy and precision when using an Analytical Balance?
Accuracy measures how close results are to the true or known value, while precision measures how close results are to one another
What is the primary purpose of a forensic microscope according to the text?
To identify and trace small evidence in crime investigations
Which feature of a forensic microscope helps in comparing collected proofs in crime investigations?
Capability to identify and analyze evidence
How does the concept of 'dispersion' relate to forensic microscopy?
It separates light into constituent wavelengths
Which type of microscope is mainly used by forensic science experts according to the text?
Binocular (stereo) microscope
Study Notes
Forensic Instrumentation
- Primary focus: analyzing evidence from crime scenes to aid in investigations and convictions
Separation of Components
- Classical methods: components of interest separated from a sample through techniques such as filtration, centrifugation, and chromatography
Microscopy
- Principal purpose: magnify and observe samples to gather detailed information
- Type used for drug identification: polarized light microscopy
- Feature helping in comparing collected proofs in crime investigations: comparison microscopy
Analytical Balance
- Purpose: measure mass of samples accurately and precisely
- Difference between accuracy and precision:
- Accuracy: how close a measurement is to the true value
- Precision: how close measurements are to each other
Forensic Microscope
- Primary purpose: examine and compare evidence found at crime scenes
- Type mainly used by forensic science experts: comparison microscope
Dispersion
- Relates to forensic microscopy: refers to the spreading of light as it passes through a sample, helping to identify materials
This quiz covers Chapter I: Introduction to Forensic Instrumentation, focusing on the methods used to determine the chemical composition of samples in forensic scenarios. Topics include qualitative and quantitative methods of analysis.
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