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Physics Theory #3

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quiz
Hanzo Conard
Quiz por Hanzo Conard, atualizado more than 1 year ago
Hanzo Conard
Criado por Hanzo Conard aproximadamente 8 anos atrás
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Resumo de Recurso

Questão 1

Questão
A point source is to be used with a concave mirror to produce a beam of parallel light.The source should be placed:
Responda
  • As close to the mirror as possible
  • At the center of curvature
  • Midway between the center of curvature and the focal point
  • Midway between the center of curvature and the mirror
  • Midway between the focal point and the mirror

Questão 2

Questão
Light from a small region of an ordinary incandescent bulb is passed through a yellow filter and then serves as the source for a Young’s double-slit experiment. Which of the following changes would cause the interference pattern to be more closely spaced?
Responda
  • Use slits that are closer together
  • Use a light source of lower intensity
  • Use a light source of higher intensity
  • Use a blue filter instead of a yellow filter
  • Move the light source further away from the slits

Questão 3

Questão
In an experiment to measure the wavelength of light using a double slit, it is found that the fringes are too close together to easily count them.To spread out the fringe pattern,one could:
Responda
  • Decrease the slit separation
  • Increase the slit separation
  • Increase the width of each slit
  • Decrease the width of each slit
  • None of these

Questão 4

Questão
If two light waves are coherent:
Responda
  • Their amplitudes are the same
  • Their frequencies are the same
  • Their wavelengths are the same
  • Their phase difference is constant
  • The difference in their frequencies is constant

Questão 5

Questão
The magnitude of the momentum of a particle can never exceed:
Responda
  • mc, where m is its mass
  • E/c, where E is its total energy
  • K/c, where K is its kinetic energy
  • None of the above, but there is an upper limit
  • None of the above; there is no upper limit

Questão 6

Questão
The units of the Planck constant h are those of:
Responda
  • Energy
  • Power
  • Momentum
  • Angular momentum
  • Frequency

Questão 7

Questão
The quantization of energy, E = nhf, is not important for an ordinary pendulum because:
Responda
  • The formula applies only to mass-spring oscillators
  • The allowed energy levels are too closely spaced
  • The allowed energy levels are too widely spaced
  • The formula applies only to atoms
  • The value of h for a pendulum is too large

Questão 8

Questão
The wavelength of light beam B is twice the wavelength of light beam B. The energy of a photon in beam A is:
Responda
  • Half the energy of a photon in beam B
  • One-fourth the energy of a photon in beam B
  • Equal to the energy of a photon in beam B
  • Twice the energy of a photon in beam B
  • Four times the energy of a photon in beam B

Questão 9

Questão
Which of the following electromagnetic radiations has photons with the greatest energy?
Responda
  • Blue light
  • Yellow light
  • X rays
  • Radio waves
  • Microwaves

Questão 10

Questão
Which of the following electromagnetic radiations has photons with the greatest momentum:
Responda
  • Blue light
  • X rays
  • Radio waves
  • Yellow light

Questão 11

Questão
In a photoelectric effect experiment no electrons are ejected if the frequency of the incident light is less than A/h, where h is the Planck constant and A is:
Responda
  • The maximum energy needed to eject the least energetic electron
  • The minimum energy needed to eject the least energetic electron
  • The maximum energy needed to eject the most energetic electron
  • The minimum energy needed to eject the most energetic electron
  • The intensity of the incident light

Questão 12

Questão
The probability that a particle is in a given small region of space is proportional to:
Responda
  • Its energy
  • Its momentum
  • The frequency of its wave function
  • The wavelength of its wave function
  • The square of the magnitude of its wave function

Questão 13

Questão
Maxwell’s equations are to electric and magnetic fields as equation is to the wave function for a particle:
Responda
  • Einstein’s
  • Fermi’s
  • Newton’s
  • Schr.odinger’s
  • Bohr’s

Questão 14

Questão
The energy of a particle in a one-dimensional trap with zero potential energy in the interior and infinite potential energy at the walls is proportional to (n = quantum number:
Responda
  • N
  • 1/n
  • 1/n^2
  • √n

Questão 15

Questão
A particle is trapped in a one-dimensional well with infinite potential energy at the walls Three possible pairs of energy levels are 1) n = 3 and n = 1 2) n = 3 and n = 2 3) n = 4 and n = 3 Order these pairs according to the difference in energy, least to greatest
Responda
  • 1, 2, 3
  • 3, 2, 1
  • 2, 3, 1
  • 1, 3, 2
  • 3, 1, 2

Questão 16

Questão
The ground state energy of an electron in a one-dimensional trap with zero potential energy in the interior and infinite potential energy at the walls:
Responda
  • Is zero
  • Decreases with temperature
  • Increases with temperature
  • Is independent of temperature
  • Oscillates with time

Questão 17

Questão
The ionization energy of an atom in its ground state is:
Responda
  • The energy required to remove the least energetic electron
  • The energy required to remove the most energetic electron
  • The energy difference between the most energetic electron and the least energetic electron
  • The same as the energy of a Kα-photon
  • The same as the excitation energy of the most energetic electron

Questão 18

Questão
In a laser:
Responda
  • Excited atoms are stimulated to emit photons by radiation external to the laser
  • The transitions for laser emission are directly to the ground state
  • The states which give rise to laser emission are usually very unstable states that decay rapidly
  • The state in which an atom is initially excited is never between two states that are involved in a stimulated emission
  • A minimum of two energy levels are required

Questão 19

Questão
The relation between the disintegration constant λ and the half-life T of a radioactive substance is:
Responda
  • λ = 2T
  • λ = 1/T
  • λ = 2/T
  • λT = ln2
  • λT = ln(1/2)

Questão 20

Questão
In a nuclear reactor the fissionable fuel is formed into pellets rather than finely ground and the pellets are mixed with the moderator This reduces the probability of
Responda
  • Non-fissioning absorption of neutrons
  • Loss of neutrons through the reactor container
  • Absorption of two neutrons by single fissionable nucleus
  • Loss of neutrons in the control rods
  • None of the above

Questão 21

Questão
In a subcritical nuclear reactor:
Responda
  • The number of fission events per unit time decreases with time
  • The number of fission events per unit time increases with time
  • Each fission event produces fewer neutrons than when the reactor is critical
  • Each fission event produces more neutrons than when the reactor is critical
  • None of the above

Questão 22

Questão
In the normal operation of a nuclear reactor:
Responda
  • Control rods are adjusted so the reactor is subcritical
  • Control rods are adjusted so the reactor is critical
  • The moderating fluid is drained
  • The moderating fluid is continually recycled
  • None of the above

Questão 23

Questão
Max Plank found his constant h
Responda
  • To get same result as Rayleigh and Jeans
  • To describe experimental intensity distribution of blackbody at ultraviolet region
  • To describe Compton scattering
  • To describe experimental intensity distribution of blackbody at long wavelengths
  • To describe experimental intensity distribution of blackbody at all wavelengths

Questão 24

Questão
Energy and momentum of photon is respectively:
Responda
  • ħω; 1/λ
  • ħω; 2πħ/λ
  • m0c^2; 2π/λ
  • m0c^2; 2πħ/λ
  • ħω; m0c^2

Questão 25

Questão
Nucleus of which element has no neutron:
Responda
  • Deuterium
  • Tritium
  • All nucleus for all elements
  • Hydrogen
  • Helium

Questão 26

Questão
The number of electron states in a shell with principal quantum number n = 3 is:
Responda
  • 3
  • 15
  • 18
  • 19
  • 25

Questão 27

Questão
The activity of radioactive substance is
Responda
  • –dN/dt
  • dN/dt
  • N0
  • N
  • Ndt

Questão 28

Questão
A hydrogen atom is in its ground state. Incident on the atom is a photon having an energy of 10.5 eV. What is the result?
Responda
  • The atom is excited to a higher allowed state
  • The atom is ionized
  • The photon passes by the atom without interaction

Questão 29

Questão
A hydrogen atom makes a transition from the n = 3 level to n = 2 level. It then makes a transition from the n = 2 level to the n = 1 level. Which transition results in emission of the longest-wavelength photon?
Responda
  • The first transition
  • The second transition
  • Either transition because the wavelengths are the same for both

Questão 30

Questão
A section of hollow pipe and a solid cylinder have the same radius, mass, and length. They both rotate about their long central axes with the same angular speed. Which object has the higher rotational kinetic energy?
Responda
  • The hollow pipe
  • The solid cylinder
  • They have the same rotational kinetic energy
  • Impossible to determine

Questão 31

Questão
Two spheres roll down an incline, starting from rest. Sphere A has the same mass and radius as sphere B, but sphere A is solid while sphere B is hollow. Which arrives at the bottom first?
Responda
  • Sphere A
  • Sphere B
  • Both arrive
  • At the same time
  • Impossible to determine

Questão 32

Questão
Two solid spheres roll down an incline, starting from rest. Sphere A has twice the mass and twice the radius of sphere B. Which arrives at the bottom first?
Responda
  • Sphere A
  • Sphere B
  • Both arrive at the same time
  • Impossible to determine

Questão 33

Questão
Which of the following statements is not true regarding a mass- spring system that moves with simple harmonic motion in absence of friction?
Responda
  • The total energy of the system remains constant
  • The energy of the system is continually transformed between kinetic and potential energy
  • The total energy of the system is proportional to the square of the amplitude
  • The potential energy stored in the system is greatest when the mass passes through the equilibrium position.

Questão 34

Questão
For an object undergoing simple harmonic motion,
Responda
  • The amplitudes are usually regarded as being large
  • The acceleration is greatest when the displacement is greatest
  • The acceleration is greatest when the speed is greatest
  • The maximum potential energy is larger than the maximum kinetic energy
  • The displacement is greatest when the speed is greatest

Questão 35

Questão
A skater can spin faster by pulling in her arms closer to her body or spin slower by spreading her arms out from her body. This is due to
Responda
  • Conservation of momentum
  • Conservation of energy
  • Newton’s third law
  • Conservation of angular momentum

Questão 36

Questão
The moment of inertia of a body depends on
Responda
  • The angular velocity
  • The angular acceleration
  • The mass distribution
  • The torque acting on the body

Questão 37

Questão
The moment of inertia of a wheel about its axle does not depend upon its:
Responda
  • Diameter
  • Mass
  • Distribution of mass
  • Speed of rotation

Questão 38

Questão
A mechanical wave generally does NOT
Responda
  • Move the medium from one place to another
  • Move through a medium
  • Move through solids
  • Disturb the medium

Questão 39

Questão
A woman sits on a spinning stool with her arms folded. When she extends her arms, which of the following occurs
Responda
  • She increases her moment of inertia, thus increasing her angular speed
  • She increases her moment of inertia, thus decreasing her angular speed.
  • She decreases her moment of inertia, thus increasing her angular speed
  • She decreases her moment of inertia, thus decreasing her angular speed
  • Her angular speed remains constant by conservation of angular momentum

Questão 40

Questão
In elastic collision between the two bodies __________.
Responda
  • Only momentum of the system is conserved
  • Only the kinetic Energy of the system is conserved
  • Both the kinetic Energy and Momentum of the system remain the same
  • Total energy is not conserved

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