Lecture 10/31

Question 1

Referring to waves, what does v mean?

Answer 1

frequency (s^-1)

Question 2

Referring to waves, what does lambda mean?

Answer 2

wavelength (m)

Question 3

Referring to waves, what does c mean?

Answer 3

speed, m/s

Question 4

_______ was the key to developing the need for quantum mechanics

Answer 4

light

Question 5

What were the three beliefs prior to quantum mechanics?

Answer 5

1. energy and matter were two different things
2. energy in the form of light described as waves
3. matter as particles

Question 6

With blackbody radiation, lower intensity red means ______

Answer 6

cool

Question 7

With blackbody radiation, lower intensity white means ______

Answer 7

hot

Question 8

With blackbody radiation, objects are heated to ______ light

Answer 8

irradiate light

Question 9

If intensity is low, then it is ____ light, _____ wavelength, ____ frequency

Answer 9

red, low, high

Question 10

If intensity is increasing, then it _____ light, _____ wavelength, _____ frequency

Answer 10

orange, decreasing, increasing

Question 11

If the intensity is at its highest, then it ____ light, ______ wavelength, _____ frequency

Answer 11

white, lowest, highest

Question 12

T or F: light acts like a particle sometimes

Answer 12

True

Question 13

T or F: energy can be gained or lost only in integer multiples of hv

Answer 13

True

Question 14

What is an equation for change in energy with hv

Answer 14

delta E= nhv

Question 15

What is h?

Answer 15

Plank’s constant, 6.626x 10^-39 j(s)

Question 16

T or F: light can only transfer in packets (quanta)

Answer 16

True

Question 17

T or F:light acts as both a wave and a particle

Answer 17

True

Question 18

What is the equation for energy of a photon?

Answer 18

E(photon)=hv/ lambda

Question 19

With energy as lambda increases the energy of photon ______

Answer 19

decreases

Question 20

What is the photoelectric effect?

Answer 20

ejections of electrons when metal is subjected to light

Question 21

intensity increase of incoming light should ______ KE of electrons

Answer 21

increase

Question 22

increase of inamplitude of -EM field _____ KE of electrons

Answer 22

increases

Question 23

oscillation of e- in metals ______ KE of electrons

Answer 23

increases

Question 24

T or F: ejection is dependent on intensity of light

Answer 24

true

Question 25

T or F: e- is emitted at all v as long as intensity is high enough

Answer 25

true

Question 26

What is the equation for KEe?

Answer 26

Kee-= 1/2 mu^2=hv-o(with a slash)

Question 27

T or F: Kinetic energy is not dependent on v

Answer 27

FALSE

Question 28

What is the definition of intensity?

Answer 28

measure of number of photons

Question 29

If there is more intensity, then there are _____ photons

Answer 29

more

Question 30

T or F: matter is dual nature

Answer 30

true

Question 31

How do you calculate the wavelength of matter?

Answer 31

lambda=h/mv

Question 32

In a line spectrum, each line corresponds to a discrete ________

Answer 32

wavelength

Question 33

The Bohr models seeks to explain the atomic spectra of ______

Answer 33

hydrogen

Question 34

When electrons jump, what are the two possibilities?

Answer 34

1. absorption of energy
2. emission of energy

Question 35

What is the equation associated with Bohr’s model?

Answer 35

E= -2.178x10^-18 J(Z^2/n^2)

Question 36

True or False: electrons closer to the nucleus have more negative energy

Answer 36

True