physics ch 3 test Flashcards Preview

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Flashcards in physics ch 3 test Deck (26)
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What is the difference between the ends of the electromagnetic spectrum?

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

1

Describe physicist James Maxwells electromagnetic theory?

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

2

State similarities of the members of the electromagnetic spectrum

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

3

State how the members of the electromagnetic spectrum differ

They vary in their energy, wave length, and frequency

4

Describe what physicist Max Planck theorized about the electromagnetic spectrum?

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

5

Define the phenomenon wave-particle duality

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

6

Know what electromagnetic radiation characteristics can be based on

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

7

Know the basic formula for calculating wavelength or frequency

Velocity= frequency x wavelength

8

Know how else electromagnetic radiation can be characterized

By how it interacts with Matter

9

Know the inverse square law

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

10

How does electromagnetic radiation exhibit wave characteristics

Transmission

11

How does electromagnetic radiation exhibit particulate characteristics?

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

Ionize matter

12

Where do X-rays originate?

Through interactions between electrons and atoms

13

When are X-ray produced?

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

14

Where does the low end of the electromagnetic spectrum begin?

Radiowaves

15

Know common uses for radiowaves

Aside from radio MRI

16

Know if radio waves ionize matter

they do NOT

17

Know common uses of microwaves

Transmit cell phone signals and heat food

18

Know if infrared light ionizes matter?

They do NOT

19

Know what visible light represents

The colors visible to the human eye

20

Know common uses of ultraviolet light

Tanning beds

21

Know if ultraviolet light ionizes matter

It does NOT

22

When are half-lives used

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

23

Know how alpha particles travel and penetrate

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

24

Know the size of the beta particulate and how they penetrate

Lighter and smaller than alpha particles and can penetrate light materials

25

Know the common uses of infrared light

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