CHAPTER 2.2 THE NATURE OF MATTER

Question 1

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Planck’s Constant

Answer 1

The constant relating the change in energy for a system to the frequency of the electromagnetic radiation absorbed or emitted; equal to 6.626 x 10^-34 J/s

Question 2

Quantized

Answer 2

The concept that energy can occur only in discrete units called quanta.

Question 2

Photons

Answer 2

A quantum of electromagnetic radiation.

Question 3

Photoelectric Effect

Answer 3

Refers to the phenomenon in which electrons are emitted from the surface of a metal when light strikes.

Question 4

Dual nature of light

Answer 4

The statement that light exhibits both wave and particulate properties.

Question 5

Diffraction

Answer 5

The scattering of light from a regular array of points or lines, producing constructive and destructive interference.

Question 6

Diffraction Pattern

Answer 6

The scattering of light from a regular array of points or lines, producing constructive and destructive interference.