Light and Quantized Energy

Question 1

What did the analysis of the emiited light of certain elements reveal?

Answer 1

That an element’s chemical behavior is related to the arrangement of electrons in its atoms

Question 2

What is electromagnetic radiation?

Answer 2

Form of energy that exhibits wavelike behavior as it travels through space;
Ex: visible light, radio waves, X rays, etc.

Question 3

What is wavelength?

Answer 3

Shortest distance between equivalent points on a continuous wave

Question 4

What is frequency?

Answer 4

Number of waves that pass at a given point per second

Question 5

What is amplitude?

Answer 5

Wave’s height from the origin to a crest, or from the origin to trough

Question 6

What is the relationship between wavelength and frequency?

Answer 6

They are inversely proportional;
As wavelenth increases, frequency decreases, and vice verca

Question 7

At what speed do all electromagnetic waves travel in a vacuum?

Answer 7

3.00 x 10^8 m/s

Question 8

What is the formula for the electromagnetic wave relationship?

Answer 8

c = v (nu) x lambda

Question 9

What does v (nu) represent?

Answer 9

Frequency

Question 10

What does lambda represent?

Answer 10

Wavelength

Question 11

What does white light contain?

Answer 11

A nearly continuous range of wavelength and frequencies

Question 12

What happens when white light passes through a prism?

Answer 12

It separates into a continuous spectrum of colors

Question 13

What is the quantum concept?

Answer 13

When objects are heated, they emit glowing light;
As the object gets hotter, it has more energy and emits different colors of light
(dark gray - orange - blue for iron)

Question 14

Who founded the quantum concept?

Answer 14

Max Planck

Question 15

What did Planck discover?

Answer 15

That matter can gain or lose energy only in small, specific amounts called quanta;
Proposed that energy emitted by hot objects was quantized

Question 16

What is quantum?

Answer 16

Minimum amount of energy that can be gained or lost by an atom

Question 17

What is the Planck Equation, and what does it say?

Answer 17

Proposed that there is a direct relationship between the energy of a quantum and the frequency of emitted radiation;
E (energy) = h x v (nu)

Question 18

What is the value of Planck’s constant?

Answer 18

6.626 x 10^-34 Joules times seconds

Question 19

What does Planck’s Equation reveal?

Answer 19

That energy of radiation increases as the radiation’s frequency increases;
That matter can emit or absorb energy only in whole number multiples of hv

Question 20

What is the Photoelectric Effect?

Answer 20

Electrons (photoelectrons) are emitted from a metal’s surface when light at or above a certain frequency shines on the surface

Question 21

What explains the Photoelectric Effect?

Answer 21

Light’s Dual Nature

Question 22

What does Light’s Dual Nature reveal about light?

Answer 22

A beam of light has wavelike and particle properties;
It is a beam of bundles of energy called photons

Question 23

What are photons?

Answer 23

Massless particles that carry a quantum energy

Question 24

What else does Light’s Dual Nature reveal?

Answer 24

Proposed that the energy of a photon must have a certain threshold value to cause the ejection of a photoelectron from the surface of the metal