Chapter 7 analytical chemistry 2

Which of the following is the correct list of the components of a typical spectroscopic instrument?

• 1. 1. Source

  2. 2. Container

  3. 3. Wavelength selector

  4. 4. Radiation detector

  5. 5. Signal processor and readout

• 1. 1. Source

  2. 2. Container

  3. 3. Amplifier

  4. 4. Transducer

  5. 5. Digital readout

• 1. 1. Source

  2. 2. Container

  3. 3. Wavelength selector

  4. 4. Camera

  5. 5. Signal processor and readout

• 1. 1. Radiation detector

  2. 2. Wavelength selector

  3. 3. Signal processor and readout

  4. 4. Source

  5. 5. Container

Tags

NGSS.HS-PS4-5

for absorption, fluorescence, and phosphorescence an external radiant energy source is required

• true

• false

Tags

NGSS.HS-PS4-3

for emission and chemiluminescence spectroscopy, an external radiant energy source is required

• true

• false

In photoluminescence spectroscopy, the source induces the sample to _____ characteristic radiation

• emit

• absorb

Tags

NGSS.HS-PS4-1

NGSS.HS-PS4-3

A source of radiation that emits a limited number of lines or bands of radiation, each of which spans a limited range of wavelengths, is known as a

• continuum source

• line source

• laser source

• the source

A source of radiation that emits a broad band of radiation that changes in intensity smoothly as a function of wavelength is known as a

• continuum source

• line source

• laser source

• the source

A source of radiation that produces a spatially narrow, extremely intense beam of radiation is known as a

• continuum source

• line source

• laser source

• the source

Tags

NGSS.HS-PS4-5

What is the term for exciting an active species of a laser by means of electric discharge, passage of electric current, or exposure to an intense radiant source?

• Pumping

• Spontaneous emission

• Stimulated emission

• Absorption

The normal emission process in which the species in the excited electronic state loses all or part of its energy by emission of radiation is known as

• spontaneous emission

• pumping

• stimulated emission

• absorption

Tags

NGSS.HS-PS4-3

When an excited laser species is hit by a photon of the same energy, it emits an identical photon and relaxes to a lower energy state. This is known as

• stimulated emission

• spontaneous emission

• pumping

• absorption

Tags

NGSS.HS-PS4-5

NGSS.HS-PS4-3