Quiz 10

Question 1

alpha radiation can make it through
1. hand
2. aluminum
3. lead
4. concrete

Answer 1

1

Question 2

beta radiation can make it through
1. hand
2. aluminum
3. lead
4. concrete

Answer 2

1, 2

Question 3

gamma radiation can make it through
1. hand
2. aluminum
3. lead
4. concrete

Answer 3

1, 2, 3

Question 4

neutrons can make it through
1. hand
2. aluminum
3. lead
4. concrete

Answer 4

all

Question 5

a gamma ray has _____ energy EM wave (light)

Answer 5

high

Question 6

does gamma rays have mass?

Answer 6

no

Question 7

what radiation is the most penetrating?

Answer 7

gamma

Question 8

is there transmutation in gamma rays?

Answer 8

no

Question 9

difference between beta-plus and beta-minus decay?

Answer 9

beta-plus = positron emission
beta-minus = nuclear electron

Question 10

what are the most massive rays?

Answer 10

alpha

Question 11

what radiation is the least penetrating?

Answer 11

alpha

Question 12

alpha particle = _____ nucleus

Answer 12

helium

Question 13

what is radiation?

Answer 13

overcoming of a strong nuclear force
disintegration of an atomic nuclei - atom trying to reach a more stable condition

Question 14

at short distances, nuclear force is _____ than Coulomb’s force and _____ overcome repulsion of protons

Answer 14

stronger
can

Question 15

describe Thompson’s “plum pudding” model

Answer 15

plum = electrons
pudding = positive charge

Question 16

describe Rutherford’s gold foil experiment?

Answer 16

the closer you shoot, the more deflection of particles

Question 17

what is the complementary principle?

Answer 17

wave and particle aspects are complementary
- both needed for full description
- not contradictory because nature never manifests both at once

Question 18

short wavelength = _____ energy

Answer 18

high

Question 19

short wavelength, high energy = _____ localization

Answer 19

precise

Question 20

short wavelength, high energy = _____ change in momentum

Answer 20

large

Question 21

long wavelength = _____ energy photon

Answer 21

low

Question 22

long wavelength = ______ localization

Answer 22

prevents

Question 23

long wavelength = _____ change in momentum

Answer 23

small

Question 24

describe Heisenberg’s uncertainty principle

Answer 24

inability to observe physical reality without disturbing it

Question 25

a baseball with mass m=0.150kg is thrown at a speed of 45m/s. use deBroglie's wave particle duality (λ=h/p)

Answer 25

h/p = h/(mv) (6.63x10^-34)/(0.15kg)(45m/s) = 9.8x10^-35

Question 26

an electron is traveling at a speed of 2.2x10^6m/s use deBroglie's wave particle duality (λ=h/p)

Answer 26

h/p=h/(mv) (6.63x10^-34)/(9.1x10^-31)(2.2x10^6) = 3.3x10^-10

Question 27

a magnesium surface has a work function of 3.68eV, what is the maximum wavelength?

Answer 27

Question 28

a magnesium surface has a work function of 3.68eV, if wavelength is 215nm, will the electron be ejected?

Answer 28

hc/λ = Wo + KEe (6.63x10^-34)(3x10^8)/(215x10^-9m) = 3.68eV (3.68)(1.6x10^-19) = 3.49x10^-19 1/2mv^2 1/2(9.1x10^-31)v^2 = 3.49x10^-19 v=8.76x10^5

Question 29

what is wave particle duality?

Answer 29

interference is a wave phenomenon - waves can exhibit particle-like characteristics - particles can exhibit wave-like characteristics - need both to irreconcilable aspects for complete description

Question 30

when photons come in, a scattered photon will have a _____ energy and a _____ wavelength

Answer 30

lower higher

Question 31

what is the Compton effect?

Answer 31

electrons should oscillate at some frequency as waves then re-rediate energy absorbed by the wave - outgoing radiation at a lower frequency and longer wavelength

Question 32

mass of a photon?

Answer 32

have no mass

Question 33

the work function for silver is Wo=4.73eV. find the minimum frequency that light must have to eject electrons from this surface?

Answer 33

Question 34

what is the photoelectric effect?

Answer 34

photons are incident on metal plate

Question 35

how many photons per second are given off by a 60W light bulb?

Answer 35

Question 36

what is Planck's quantization hypothesis?

Answer 36

energy is quantized

Question 37

higher energy = ____ frequency

Answer 37

higher

Question 38

higher energy = _____ wavelength

Answer 38

lower