4. Electromagnetic Energy

Question 1

Photons was first described by

Answer 1

ancient Greeks

Question 2

Photons are now known as

Answer 2

electromagnetic energy

Question 3

No mass, no identifiable form

Answer 3

Photons

Question 4

They do have electric and magnetic fields that are continuously changing in sinusoidal fashion

Answer 4

Photons/Electromagnetic Energy

Question 5

is the smallest quantity of any type of electromagnetic energy

Answer 5

Photon

Question 6

A photon may be pictured as a small bundle of energy, sometimes called _____

Answer 6

quantum

Question 7

Showed that visible light has both electric and magnetic properties, hence the term electromagnetic energy and year

Answer 7

James Clerk Maxwell, late 19th century

Question 8

Properties of EM Radiation

Answer 8

• It can travel through empty space
• It travels with the speed of light
• It travels in a wave-like fashion

Question 9

The velocity of all electromagnetic radiation is

Answer 9

3 x10^8 m/s or 186,000 miles per second (speed of light)

Question 10

The distance from one crest to another, from one valley to another, or from any point on the sine wave to the next corresponding point

Answer 10

Wavelength

Question 11

is the number of wavelength that pass a point of observation per second

Answer 11

Frequency

Question 12

The frequency range of electromagnetic energy extends from approximately

Answer 12

10^2

to 10^24 Hz

Question 13

The wavelengths are approximately

Answer 13

10^7 to 10^-16 m

Question 14

What your eye detects

Answer 14

Visible light

Question 15

Visible light has a wavelength of

Answer 15

4000 to 8000 angstroms

Question 16

1 angstrom =

Answer 16

1.0 x10^-10 m

Question 17

1 nm =

Answer 17

1.0 x10-9 m = 10 angstrom

Question 18

Relatively low energy and relatively very long wavelength

Answer 18

Radiofrequency

Question 19

Ionizing Radiation

Answer 19

Gamma ray

X-ray

Question 20

Photons interact with matter most easily when matter is approximately the same size as the photon wavelength

Answer 20

Wave-Particle Duality

Question 21

All radiation with wavelength longer than those of x-radiation interacts primarily as a

Answer 21

wave phenomenon (Wave-Particle Duality)

Question 22

He created the quantum theory

Answer 22

Max Planck

Question 23

X-rays are created with the speed of light (c), and they exist with the velocity (c) or they do not exist at all

Answer 23

Quantum Theory

Question 24

Also known as Planck’s constant

Answer 24

The Constant of Proportionality

Question 25

Planck’s constant (h), has a numeric value of

Answer 25

4.15 x10^-15 eVs or 6.63 x10^-34 Js

Question 26

mass of electron

Answer 26

9.109 x10^-31 kg

Question 26

1 J=

Answer 26

6.24 x10^18 eV

Question 27

travels faster than the speed of light

Answer 27

Cherenkov