physics ch 3 test

Question 0

Describe physicist James Maxwells electromagnetic theory?

Answer 0

All electromagnetic radiation is very similar in that it has zero 0 mass (meaning it weighs nothing), it carries energy in waves as electric and magnetic disturbances in space, and travels at the speed of light

Question 1

What is the difference between the ends of the electromagnetic spectrum?

Answer 1

The only high-energy radiation (x-rays and gamma rays) have the ability to ionize(damage) matter

Question 2

State similarities of the members of the electromagnetic spectrum

Answer 2

They have the same velocity (the speed of light or 3x10^8 m/s)

Question 3

State how the members of the electromagnetic spectrum differ

Answer 3

They vary in their energy, wave length, and frequency

Question 4

Describe what physicist Max Planck theorized about the electromagnetic spectrum?

Answer 4

For the direct proportionality between energy and frequency, as the frequency increases so does the energy.

Electromagnetic radiation can only exist as “packets” of energy later called protons

Question 5

Define the phenomenon wave-particle duality

Answer 5

Electromagnetic radiation exhibits properties of a wave or a particle depending on its energy and in some cases it’s environment

Question 6

Know what electromagnetic radiation characteristics can be based on

Answer 6

Wave characteristics of velocity, amplitude, wave length, and frequency

Question 7

Know the basic formula for calculating wavelength or frequency

Answer 7

Velocity= frequency x wavelength

Question 8

Know how else electromagnetic radiation can be characterized

Answer 8

By how it interacts with Matter

Question 9

Know the inverse square law

Answer 9

The intensity of light diminishes by a factor of the square of the distance from the source.

Used to calculate the change in the intensity or quantity of radiation reaching the IR with changes in distance

Question 10

How does electromagnetic radiation exhibit wave characteristics

Answer 10

Transmission

Question 11

How does electromagnetic radiation exhibit particulate characteristics?

Answer 11

Burn the skin, and intensity varies due to to inverse square law

Ionize matter

Question 12

Where do X-rays originate?

Answer 12

Through interactions between electrons and atoms

Question 13

When are X-ray produced?

Answer 13

When fast-moving electrons in the x-ray tube strike the Atoms of the metal in its target

Question 14

Where does the low end of the electromagnetic spectrum begin?

Answer 14

Radiowaves

Question 15

Know common uses for radiowaves

Answer 15

Aside from radio MRI

Question 16

Know if radio waves ionize matter

Answer 16

they do NOT

Question 17

Know common uses of microwaves

Answer 17

Transmit cell phone signals and heat food

Question 18

Know if infrared light ionizes matter?

Answer 18

They do NOT

Question 19

Know what visible light represents

Answer 19

The colors visible to the human eye

Question 20

Know common uses of ultraviolet light

Answer 20

Tanning beds

Question 21

Know if ultraviolet light ionizes matter

Answer 21

It does NOT

Question 22

When are half-lives used

Answer 22

To measure radioactivity because that is how radioactive substances happen to decay

Question 23

Know how alpha particles travel and penetrate

Answer 23

They do not travel very far due to being large and cannot penetrate most objects

Question 24

Know the size of the beta particulate and how they penetrate

Answer 24

Lighter and smaller than alpha particles and can penetrate light materials

Question 25

Know the common uses of infrared light

Answer 25

Beam information between electronic devices. TV remote to tv… Cell phone to computer