Light And Atoms

Question 1

What type of wave is light?

Answer 1

Electromagnetic

Question 2

Light is composed of what?

Answer 2

Oscillating electric and magnetic fields

Question 3

Which way do fields oscillate?

Answer 3

Perpendicular to each other and to the direction of travel

Question 4

How is light produced

Answer 4

Accelerating charges

Question 5

How does light behave

Answer 5

Like a wave in some instances and a particle in others

Question 6

Like a wave in some instances and a particle in others

Answer 6

Particle-wave duality

Question 7

Longest waves, mostly used for communication

Answer 7

Radio waves

Question 8

Next longest wavelengths, normally used to heat food

Answer 8

Microwaves

Question 9

Type of radiation felt as heat, not small enough to see

Answer 9

Infrared

Question 10

Our eyes have evolved to detect this for of electromagnetic radiation

Answer 10

Visible light

Question 11

Shorter wavelengths than visible light and now energetic enough to burn skin

Answer 11

Ultraviolet light

Question 12

More energetic yet and can now travel through and damage most of our body, so we wear lead coverings to protect us

Answer 12

X-rays

Question 13

Have the shortest wavelengths, and most energetic,produced during large astronomical explosions

Answer 13

Gamma rays

Question 14

As an object’s temperature increases…

Answer 14

It radiates energy more strongly at shorter wavelengths

Question 15

Wavelengths most strongly radiated are…

Answer 15

Inversely proportional to its temperature

Question 16

Wein’s law

Answer 16

/=2.90*10^6/T

Question 17

Each element has a unique set of — at which electrons can exist

Answer 17

Energy levels

Question 18

Difference between energy levels

Answer 18

The energies an atom absorb when electrons jump up an energy level or emit when electrons drop down a level

Question 19

The wavelength of light emitted by the jumps is determined using

Answer 19

Planck’s Law

Question 20

Planck’s Law

Answer 20

E=hf h=6.63*10^-34

Question 21

Each element has a unique set of — that emits and absorbs that can be used to identify it

Answer 21

Wavelengths

Question 22

The technique used to capture and analyze a spectrum

Answer 22

Spectroscopy

Question 23

All wavelengths are emitted with smooth transitions between wavelengths, produced when a substance has a high density

Answer 23

Continuous Spectrum

Question 24

Light is emitted at only a few particular wavelengths, produced by substances with a low density

Answer 24

Emission Spectrum

Question 25

Nearly all wavelengths of light are emitted but light is either missing or dimmer at particular wavelengths, the few particular missing or dimmer wavelengths are absorbed by substances the light travels through

Answer 25

Absorption Spectrum

Question 26

The missing or dim lines

Answer 26

Fraunhofer lines