chapter 7

which of these is an application of lasers ?

• Lasers are integral parts of compact disc players

• lasers are used in surgeries

• lasers are integral parts of supermarket scanners

• lasers are used in surveying equipment

• all of these

Which of these processes is/are responsible for the breaking of bonds within a molecule?

I. Photodecomposition

II. Fluorescence

III. Emission of heat

• 1

• 1 and 2

• 3 and 2

• 1,2,3

• 1 and 3

the interaction of matter and light is known as

When excited, a particular element emits yellow light with wavelength 589 nm. Identify the element.

• sodium

• hydrogen

• lithium

• helium

• mercury

Which of these colors of visible light has the lowest energy?

• orange

• red

• yellow

• blue

• violet

Which of these processes could occur during electronic relaxation?

I. Photodecomposition

II. Fluorescence

III. Emission of heat

• 1 only

• 1 and 2

• 2 and 3

• 1 and 3

• 1,2 and 3

The processes by which an excited electron returns to its ground state with the emission of energy is known as ____.

• photodecomposition

• electronic relaxation

• spectroscopy

• electronic degradation

• microwave radition

_____ is responsible for the fading of fabrics on continuous exposure to sunlight.

 

• flurescence

• Photodecomposition

• Photophosrescence

• relaxation

• electronic relaxtion

which of these is not a form of spectroscopy?

• NMR

• MRI

• Photochemistry

• phosphorescence

• fluorescence

Which of these statements is not true concerning the nature of light?

• Light has both particle and wave characteristics.

• Particles of light are collectively called photons.

• Light travels faster in space than it does on Earth.

• The wave nature of light has both a magnetic component and an electrical component.

• The wavelength of light is inversely proportional to the frequency of light.