Physics Test 3

Front 1

What is a black body?

Back 1

a theoretical object that absorbs 100% of light incident upon it and then reradiates it

Front 2

Wien's law states that

Back 2

the wavelength of the maximum intensity of a black body is inversely proportional to the temperature of the black body

Front 3

The Stefan-Boltzman law sates that

Back 3

the area under a black body curve is proportional to the temperature of the black body raised to the 4th power

Front 4

Planck solved the ultraviolet catastrophe problem by

Back 4

treating light statistically and introducing the idea of quanta

Front 5

the purest black body curve ever measured is that of

Back 5

the cosmic microwave background radiation

Front 6

Lenard's experiments with the photoelectric effect showed that

Back 6

a greater intensity of light incident on a metal resulted in more electrons being emitted from the metal

Front 7

Lenard's experiments with the photoelectric effect also showed that

Back 7

a greater frequency of light incident on a metal resulted in higher kinetic energy for the electrons being emitted from the metal

Front 8

Electron microscopes have better resolution than ordinary microscopes because

Back 8

the de Broglie wavelength of electrons is smaller than the wavelength of light

Front 9

Einstein explained Lenard's results by suggesting that

Back 9

light displayed particle-like behavior (photons), so that all the electrons in themetal would be hit by the photons one at a time

Front 10

Which of the following statements is correct?

Back 10

cell phones cannot cause cancer by creating mutant strands of DNA since they emit low frequency radiation

Front 11

The Bohr model of the hydrogen atom was

Back 11

a proton as the nucleus and one electron that could be in any one of the many discrete energy levels

Front 12

An absorption line spectrum of a star is observed when

Back 12

the star's light is seen through cooler gas

Front 13

According to the Bohr model of hydrogen

Back 13

a photon is emitted when the electron jumps down in energy

Front 14

A particle's wave function helps determine the probability of finding the particle

Back 14

at a particular position at a particular time

Front 15

Which of the following analogies is not correct?

Back 15

schrodinger's equation is to quantum mechanics what the Doppler effect is to optics

Front 16

The relation between diffraction angle (theta), wavelength (lambda) and slit width W is

Back 16

theta=lambda/W

Front 17

In an electron diffraction experiment

Back 17

the narrower the slit width, the more spread out is the resulting diffraction pattern

Front 18

One way of (approximately) formulating the Heisenburg Uncertainty Principle is

Back 18

h= deltaXdeltaP

Front 19

One way of thinking about the Heisenburg Uncertainty Principle is that

Back 19

one cannot know both the exact position and the exact momentum of a particle simultaneously

Front 20

The Heisenburg Uncertainty Principle does not apply on macroscopic scales because

Back 20

uncertainties calculated using the principle are too small to measure

Front 21

The main advocates of the Copenhagen's Interpretation of QM are

Back 21

Bohr and Heisenberg

Front 22

In the Copenhagen Interpretation, Complementary means

Back 22

two properties of an object can't be seen simultaneously despite their simultaneous existence

Front 23

In the Copenhagen Interpretation, the correspondences principle meas

Back 23

the behavior described by QM must reproduce classical physics when quantum numbers get large

Front 24

In the Copenhagen Interpretation, collapse of the wave function means

Back 24

that once an object whose properties can only be described by probabilities is measured, it comes into well defined existence

Front 25

The famous Solvay Conference of Physicists that we often refer to in class was held in the year

Back 25

1927

Front 26

Schrodinger's cat was a thought experiment proposed by

Back 26

Schrodinger that challenged the Copenhagen Interpretation

Front 27

The Schrodinger's cat viewpoint of the Copenhagen Interpretation is that the cat i

Back 27

is a mixture of dead and alive before the box was open

Front 28

The movie Sliding Doors was an example of

Back 28

the Many Worlds hypothesis

Front 29

Einstein thought that the theory of

Back 29

QM was incomplete

Front 30

The idea of quantum entanglement has led to experiments involving

Back 30

quantum teleportation

Front 31

The Paulie Exclusion principle states that

Back 31

two fermions cannot be in the same quantum state

Front 32

The Pauli Exclusion principle is intimately associated with

Back 32

the structure of the periodic table of elements

Front 33

Neutrons stars and white dwarfs are supported by degeneracy pressure, but the neutron stars are smaller than white dwarfs because

Back 33

neutrons can be packed together more closely than electrons according to the Heisenberg Uncertainty Principle

Front 34

Which of the following statements regarding quantum numbers is not correct

Back 34

S is the the specific quantum number indicating special relativistic momentum

Front 35

Which of the following statements is correct?

Back 35

the sizes of atoms sometimes increase and sometimes decrease as the number of protons and electrons increases

Front 36

Rutherford's famous experiment bombarding gold foil with alpha particles

Back 36

revealed the structure of an atom

Front 37

Protons and neutrons are held together in the nucleus via

Back 37

the strong nuclear force

Front 38

The chart of nuclides shows that

Back 38

the number of neutrons is greater than the number of protons in most nuclei

Front 39

Half life is

Back 39

the period of time it takes for a substance undergoing decay to decrease by half

Front 40

Carbon 14 is useful in dating organic material (like wood, leather, and cloth)

Back 40

because its half-life is about 5 thousand years ago