Quiz
Physics Theory #3
Questions in this quiz (40)
1A point source is to be used with a concave mirror to produce a beam of parallel light.The source should be placed:
- AAs close to the mirror as possible
- BAt the center of curvature
- CMidway between the center of curvature and the focal point
- DMidway between the center of curvature and the mirror
- EMidway between the focal point and the mirror
2Light 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?
- AUse slits that are closer together
- BUse a light source of lower intensity
- CUse a light source of higher intensity
- DUse a blue filter instead of a yellow filter
- EMove the light source further away from the slits
3In 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:
- ADecrease the slit separation
- BIncrease the slit separation
- CIncrease the width of each slit
- DDecrease the width of each slit
- ENone of these
4If two light waves are coherent:
- ATheir amplitudes are the same
- BTheir frequencies are the same
- CTheir wavelengths are the same
- DTheir phase difference is constant
- EThe difference in their frequencies is constant
5The magnitude of the momentum of a particle can never exceed:
- Amc, where m is its mass
- BE/c, where E is its total energy
- CK/c, where K is its kinetic energy
- DNone of the above, but there is an upper limit
- ENone of the above; there is no upper limit
6The units of the Planck constant h are those of:
- AEnergy
- BPower
- CMomentum
- DAngular momentum
- EFrequency
7The quantization of energy, E = nhf, is not important for an ordinary pendulum because:
- AThe formula applies only to mass-spring oscillators
- BThe allowed energy levels are too closely spaced
- CThe allowed energy levels are too widely spaced
- DThe formula applies only to atoms
- EThe value of h for a pendulum is too large
8The wavelength of light beam B is twice the wavelength of light beam B. The energy of a photon in beam A is:
- AHalf the energy of a photon in beam B
- BOne-fourth the energy of a photon in beam B
- CEqual to the energy of a photon in beam B
- DTwice the energy of a photon in beam B
- EFour times the energy of a photon in beam B
9Which of the following electromagnetic radiations has photons with the greatest energy?
- ABlue light
- BYellow light
- CX rays
- DRadio waves
- EMicrowaves
10Which of the following electromagnetic radiations has photons with the greatest momentum:
- ABlue light
- BX rays
- CRadio waves
- DYellow light
11In 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:
- AThe maximum energy needed to eject the least energetic electron
- BThe minimum energy needed to eject the least energetic electron
- CThe maximum energy needed to eject the most energetic electron
- DThe minimum energy needed to eject the most energetic electron
- EThe intensity of the incident light
12The probability that a particle is in a given small region of space is proportional to:
- AIts energy
- BIts momentum
- CThe frequency of its wave function
- DThe wavelength of its wave function
- EThe square of the magnitude of its wave function
13Maxwell’s equations are to electric and magnetic fields as equation is to the wave function for a particle:
- AEinstein’s
- BFermi’s
- CNewton’s
- DSchr.odinger’s
- EBohr’s
14The 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:
- AN
- B1/n
- C1/n^2
- D√n
15A 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- A1, 2, 3
- B3, 2, 1
- C2, 3, 1
- D1, 3, 2
- E3, 1, 2
16The 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:
- AIs zero
- BDecreases with temperature
- CIncreases with temperature
- DIs independent of temperature
- EOscillates with time
17The ionization energy of an atom in its ground state is:
- AThe energy required to remove the least energetic electron
- BThe energy required to remove the most energetic electron
- CThe energy difference between the most energetic electron and the least energetic electron
- DThe same as the energy of a Kα-photon
- EThe same as the excitation energy of the most energetic electron
18In a laser:
- AExcited atoms are stimulated to emit photons by radiation external to the laser
- BThe transitions for laser emission are directly to the ground state
- CThe states which give rise to laser emission are usually very unstable states that decay rapidly
- DThe state in which an atom is initially excited is never between two states that are involved in a stimulated emission
- EA minimum of two energy levels are required
19The relation between the disintegration constant λ and the half-life T of a radioactive substance is:
- Aλ = 2T
- Bλ = 1/T
- Cλ = 2/T
- DλT = ln2
- EλT = ln(1/2)
20In 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
- ANon-fissioning absorption of neutrons
- BLoss of neutrons through the reactor container
- CAbsorption of two neutrons by single fissionable nucleus
- DLoss of neutrons in the control rods
- ENone of the above
21In a subcritical nuclear reactor:
- AThe number of fission events per unit time decreases with time
- BThe number of fission events per unit time increases with time
- CEach fission event produces fewer neutrons than when the reactor is critical
- DEach fission event produces more neutrons than when the reactor is critical
- ENone of the above
22In the normal operation of a nuclear reactor:
- AControl rods are adjusted so the reactor is subcritical
- BControl rods are adjusted so the reactor is critical
- CThe moderating fluid is drained
- DThe moderating fluid is continually recycled
- ENone of the above
23Max Plank found his constant h
- ATo get same result as Rayleigh and Jeans
- BTo describe experimental intensity distribution of blackbody at ultraviolet region
- CTo describe Compton scattering
- DTo describe experimental intensity distribution of blackbody at long wavelengths
- ETo describe experimental intensity distribution of blackbody at all wavelengths
24Energy and momentum of photon is respectively:
- Aħω; 1/λ
- Bħω; 2πħ/λ
- Cm0c^2; 2π/λ
- Dm0c^2; 2πħ/λ
- Eħω; m0c^2
25Nucleus of which element has no neutron:
- ADeuterium
- BTritium
- CAll nucleus for all elements
- DHydrogen
- EHelium
26The number of electron states in a shell with principal quantum number n = 3 is:
- A3
- B15
- C18
- D19
- E25
27The activity of radioactive substance is
- A–dN/dt
- BdN/dt
- CN0
- DN
- ENdt
28A 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?
- AThe atom is excited to a higher allowed state
- BThe atom is ionized
- CThe photon passes by the atom without interaction
29A 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?
- AThe first transition
- BThe second transition
- CEither transition because the wavelengths are the same for both
30A 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?- AThe hollow pipe
- BThe solid cylinder
- CThey have the same rotational kinetic energy
- DImpossible to determine
31Two 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?- ASphere A
- BSphere B
- CBoth arrive
- DAt the same time
- EImpossible to determine
32Two 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?- ASphere A
- BSphere B
- CBoth arrive at the same time
- DImpossible to determine
33Which of the following statements is not true regarding a mass- spring system that moves with simple harmonic motion in absence of friction?
- AThe total energy of the system remains constant
- BThe energy of the system is continually transformed between kinetic and potential energy
- CThe total energy of the system is proportional to the square of the amplitude
- DThe potential energy stored in the system is greatest when the mass passes through the equilibrium position.
34For an object undergoing simple harmonic motion,
- AThe amplitudes are usually regarded as being large
- BThe acceleration is greatest when the displacement is greatest
- CThe acceleration is greatest when the speed is greatest
- DThe maximum potential energy is larger than the maximum kinetic energy
- EThe displacement is greatest when the speed is greatest
35A 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
- AConservation of momentum
- BConservation of energy
- CNewton’s third law
- DConservation of angular momentum
36The moment of inertia of a body depends on
- AThe angular velocity
- BThe angular acceleration
- CThe mass distribution
- DThe torque acting on the body
37The moment of inertia of a wheel about its axle does not depend upon its:
- ADiameter
- BMass
- CDistribution of mass
- DSpeed of rotation
38A mechanical wave generally does NOT
- AMove the medium from one place to another
- BMove through a medium
- CMove through solids
- DDisturb the medium
39A woman sits on a spinning stool with her arms folded. When she extends her arms, which of the following occurs
- AShe increases her moment of inertia, thus increasing her angular speed
- BShe increases her moment of inertia, thus decreasing her angular speed.
- CShe decreases her moment of inertia, thus increasing her angular speed
- DShe decreases her moment of inertia, thus decreasing her angular speed
- EHer angular speed remains constant by conservation of angular momentum
40In elastic collision between the two bodies __________.
- AOnly momentum of the system is conserved
- BOnly the kinetic Energy of the system is conserved
- CBoth the kinetic Energy and Momentum of the system remain the same
- DTotal energy is not conserved
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