Chapter 7

Question 1

when wavelength is short, what does that mean for frequency?

Answer 1

high frequency

Question 2

what color has the highest energy?

Answer 2

violet

Question 3

what color has the lowest energy?

Answer 3

red

Question 4

what is an example of red light?

Answer 4

radio waves

Question 5

what is an example of orange light?

Answer 5

microwaves

Question 6

what is an example of yellow light?

Answer 6

infrared

Question 7

what colors of light are visable?

Answer 7

green, blue, indigo, violet

Question 8

what is an example of green light?

Answer 8

ultraviolet

Question 9

what is an example of blue light?

Answer 9

x-ray

Question 10

what is an example of violet light?

Answer 10

gamma ray

Question 11

what is the wavelength?

Answer 11

distance between two maxima
(distance between two wawves)

Question 12

what is amplitude?

Answer 12

height of each wave

Question 13

in comparing two lightbulbs, if they each have different amplitudes, what does that do?

Answer 13

each lightbulb will have different brightness
the short amplitude will have dim light
the long amplitude will have bright light

Question 14

in comparing two lightbulbs, if they each have different amplitudes, what does that do?

Answer 14

each light bulb will have different brightness
the short amplitude will have dim light
the long amplitude will have bright light

Question 15

what is frequency (v)?

Answer 15

is the number of cycles per unit time

Question 16

what does low frequency mean for wavelength?

Answer 16

long wavelength

Question 17

what is the speed of light?

Answer 17

c = 3.00x10^8 m s^-1

Question 18

what happens when a wave encounters an obstacle or slit?

Answer 18

it bends (or diffracts) around it

Question 19

what happens when a particle encounters an obstacle or slit?

Answer 19

the particle goes straight through the slit

Question 20

when light acts as a particle, what is it called?

Answer 20

the photoelectric effect and blackbody radiation

Question 21

what happens with higher frequencies (such as indigo)?

Answer 21

more electrons will be able to be transferred

Question 22

what happens when the intensity of the light increases?

Answer 22

more electrons will be transferred

Question 23

what did albert einstein say about light particles?

Answer 23

light consists of discrete packets called quanta (photons)

Question 24

what did max planck say about light particles?

Answer 24

energy is directly proportional to the frequency

Question 25

what is a beam of light?

Answer 25

a stream of photons of the same energy

Question 26

what is plancks constant?

Answer 26

6.626x10^-34 Js

Question 27

what does E stand for?

Answer 27

energy of one photon

Question 28

what is the photoelectric effect?

Answer 28

energy transfer from the light (one photon) to an electron in the metal

Question 29

in order to eject an electron?

Answer 29

energy of an incoming photon Ei must be equal or greater than the work function in order to eject electron

Question 30

what does leftover energy turn into?

Answer 30

KE

Question 31

label the electrons ejected if its positive or negative *electrons ejected

Question 32

does the energy of the emitted electrons depend on the intensity of the incoming light?

Answer 32

no

Question 33

what does the energy of one electron depend on?

Answer 33

the energy of one photon

Question 34

when an atom absorbs energy what does it re-emit as?

Answer 34

light

Question 35

light emitted by atoms contains how many wavelengths?

Answer 35

several wavelengths

Question 36

when electrons jump shells, what happens?

Answer 36

they absorb energy

Question 37

electron is never observed between states, what does that result in?

Answer 37

resulting in the discrete lines the emission spectrum

Question 38

when an electron falls back to lower energy level, what happens?

Answer 38

light is emitted

Question 39

what happens when an electron absorbs energy?

Answer 39

the electron is gets excited to an unstable energy level

Question 40

can the energy of a photon be negative?

Answer 40

no, always positive

Question 41

transition between levels that are farther apart in energy produce what?

Answer 41

light that is shorter in wavelength

Question 42

what does the absorption of the shortest wavelength look like?

Answer 42

big distance between shells

Question 43

what did louis de broglie say about light?

Answer 43

if light has wave-like and particle-like properties, matter (electrons) must be both particle- like and a wave-like
(light has both particle- like and wave-like properties)

Question 44

how are we waves?

Answer 44

matter is a wave, and everything is made of matter thus atoms and electrons are also waves

Question 45

what is h?

Answer 45

planck’s constant = 6.626x10^-34 Js

Question 46

what unit is wavelength in?

Answer 46

m (its lamda)