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Physics 201: General Physics II > Quiz 10 > Flashcards

Quiz 10 Flashcards

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1
Q

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

A

1

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2
Q

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

A

1, 2

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3
Q

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

A

1, 2, 3

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4
Q

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

A

all

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5
Q

a gamma ray has _____ energy EM wave (light)

A

high

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6
Q

does gamma rays have mass?

A

no

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7
Q

what radiation is the most penetrating?

A

gamma

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8
Q

is there transmutation in gamma rays?

A

no

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9
Q

difference between beta-plus and beta-minus decay?

A

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

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10
Q

what are the most massive rays?

A

alpha

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11
Q

what radiation is the least penetrating?

A

alpha

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12
Q

alpha particle = _____ nucleus

A

helium

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13
Q

what is radiation?

A

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

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14
Q

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

A

stronger
can

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15
Q

describe Thompson’s “plum pudding” model

A

plum = electrons
pudding = positive charge

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16
Q

describe Rutherford’s gold foil experiment?

A

the closer you shoot, the more deflection of particles

17
Q

what is the complementary principle?

A

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

18
Q

short wavelength = _____ energy

A

high

19
Q

short wavelength, high energy = _____ localization

A

precise

20
Q

short wavelength, high energy = _____ change in momentum

A

large

21
Q

long wavelength = _____ energy photon

A

low

22
Q

long wavelength = ______ localization

A

prevents

23
Q

long wavelength = _____ change in momentum

A

small

24
Q

describe Heisenberg’s uncertainty principle

A

inability to observe physical reality without disturbing it

25
Q

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

A

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

26
Q

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

A

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

27
Q

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

A
28
Q

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

A

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

29
Q

what is wave particle duality?

A

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

30
Q

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

A

lower
higher

31
Q

what is the Compton effect?

A

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

32
Q

mass of a photon?

A

have no mass

33
Q

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

A
34
Q

what is the photoelectric effect?

A

photons are incident on metal plate

35
Q

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

A
36
Q

what is Planck’s quantization hypothesis?

A

energy is quantized

37
Q

higher energy = ____ frequency

A

higher

38
Q

higher energy = _____ wavelength

A

lower

Physics 201: General Physics II (7 decks)

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