Quantum Theory & Atomic Theory

Question 1

What model of of the atom do we currently use?

Answer 1

The Quantum Model

Question 2

In classical physics, what are some properties of matter?

Answer 2

1) Matter is particulate (“Chunks”)

2) Moves in a definite path

Question 3

In classical physics, what are some properties of energy?

Answer 3

1) Continuous

2) Moves in all directions

Question 4

What speed do all electromagnetic waves travel at?

Answer 4

At the speed of light (2.998 x 10^8)

Question 5

What is refraction?

Answer 5

Bonding of light (ex: rainbow)

Question 6

What is diffraction?

Answer 6

Interference of light (laser shining on a CD)

Question 7

Characteristic Phenomena of Electromagnetic Radiation?

Answer 7

1) Refraction

2) Diffraction

Question 8

List 3 experiments which show that light is a both a wave and matter

Answer 8

1) Blackbody Radiation
2) Photoelectric Effect
3) Atomic Spectrum

Question 9

What is the photoelectric effect?

Answer 9

When monochromatic light shines on a metal surface, electrons are ejected.
weird Observations:
1) Electrons are ejected only if light exceeds a minimum frequency
2) There is no time lag from expoure of light to ejection of electrons

Question 10

What are discrete energy packets called?

Answer 10

Quanta

Question 11

Light energy is quantized in packets called _______

Answer 11

photons

Question 12

How does the atomic spectrum show that light is quantized (both a wave and a particle)?

Answer 12

The discontinuous lines spectra of elements suggest that their energy is quantized