What primary wavelength and corresponding photon energy is emitted by a body at:
(a) 400.°C?
(b) 800.°C?
(c) 1200.°C?
An electron is moving with speed 21. m/s.
(a) What is its deBroglie wavelength?
(b) What Diffraction Grating spacing between slits would give a 1st order maximum at
30.0?
The charge carried by one electron is e = -1.6 10-19 C. The number of electrons
necessary to produce a charge of -1.0 C is
A) 6.3 1018.
B) 6.3 109.
C) 1.6 1019.
D) 1.6 109.
E) none of the above
In adding the numbers 420.77, 13.821, and 2317.8
(a) the result should be rounded to how many significant figures?
(b) what is the sum?
The theory of special relativity
A) is based on a complex mathematical analysis.
B) does not agree with electromagnetic theory.
C) does not agree with Newtonian mechanics.
D) has not been verified by experiment.
Which of the following is not massless?
A) neutrino
B) graviton
C) photon
D) muon
Which two temperature changes are equivalent?
A) 1 K, 1 F°
B) 1 F°, 1 C°
C) 1 C°, 1 K
D) -40 C°, -40 F°
FIGURE 13-5
Fig. 13-5 is a “snapshot” of a wave at a given time. The frequency of the wave is 120
Hz. What is the amplitude?
A) 0.05 m
B) 0.10 m
C) 0.15 m
D) 0.20 m
The formula mg = kx describes a spring that is stretched by hanging an object on it. The
constant k is called the spring constant. What are its units?
A) m s2/kg
B) kg/s2
C) kg s2
D) s/m kg
E) N m
When sound passes from air into water
A) its wavelength does not change.
B) its frequency does not change.
C) its velocity does not change.
A charged particle is injected into a uniform magnetic field such that its velocity vector
is perpendicular to the magnetic field vector. Ignoring the particle’s weight, the particle
will
A) move in a straight line.
B) follow a spiral path.
C) follow a circular path.
D) move along a parabolic path.
E) immediately stop.
The condition for interference maxima for a diffraction grating is identical to that for
A) a narrowing single slit.
B) a double slit.
C) a thin film.
D) a wide single slit.
A chunk of ice (T = -20°C) is added to a thermally insulated container of cold water (T
= 0°C). What happens in the container?
A) The water cools down until thermal equilibrium is established.
B) The ice melts until thermal equilibrium is established.
C) Some of the water freezes and the chunk of ice gets larger.
Consider two diffraction gratings; one has 4000 lines per cm and the other one has 6000
lines per cm.
A) The 4000-line grating produces the greater dispersion.
B) Both gratings produce the same dispersion, but the orders are sharper for the
4000-line grating.
C) Both gratings produce the same dispersion, but the orders are sharper for the
6000-line grating.
D) The 6000-line grating produces the greater dispersion.
An ion enters a mass spectrometer which has a 0.18 Tesla field perpendicular to
an electric field of 1.6 kV/m and selects a velocity. The same magnetic field is then
used to deflect the singly charged ion into a circular path of radius 12.5 cm.
(a) What velocity was selected?
(b) What was the ion mass?
The Otto cycle has how many strokes per cycle during which the volume decreases?
A) 8
B) 4
C) 2
D) 1
E) 3
A potter’s wheel with a moment of inertia of 8.0 kg-m2 has 5.0 N-m applied to it. It
starts from rest. 10. s later it has gained what kinetic energy?
A) 44. J
B) 0.12 kJ
C) 78. J
D) 1.6 kJ
E) 53. J
A decoration, of mass M, is suspended by a string from the ceiling inside an elevator.
The elevator is traveling UPWARD with a constant speed. The tension in the string is
A) greater than Mg.
B) less than Mg.
C) equal to Mg.
D) impossible to tell without knowing the speed.
E) impossible to tell without knowing the decoration mass.
FIGURE 5-8
NOTE: The following question(s) refer(s) to the Cyclone, the famous roller coaster ride
at Coney Island, shown in the sketch. Assume no friction.
Refer to Fig. 5-8. How much work was required to bring the 1000-kg roller coaster
from point P to rest at point Q at the top of the 50. m peak?
A) 50. kJ
B) 0.25 MJ
C) 32. kJ
D) 0.49 MJ
E) 75. kJ
Light of wavelength 500 nm is incident on a thin sheet of plastic film (n= 1.50) in air.
What is the thinnest the sheet can be so that the reflected light from the surfaces
undergoes constructive interference?
A) 50 nm
B) 250 nm
C) 333 nm
D) 167 nm
E) 83 nm
A sunken steel ship has a mass of 500,000 kg. It is filled with water. In order to lift the
ship, air bags are to be inflated inside the hull. What volume of air is needed if 7.8 is the
specific gravity of steel?
A) 1266 m3
B) 436 m3
C) 872 m3
D) 225 m3
E) 2778 m3
One of Einstein’s postulates in formulating the special theory of relativity was that the
laws of physics are the same in reference frames that
A) accelerate.
B) move at constant velocity with respect to an inertial frame.
C) are stationary, but not in moving frames.
D) oscillate.
An optical fiber is 1.00 meter long and has a diameter of 20.0 μm. Its ends are
perpendicular to its axis. Its index of refraction is 1.30. What is the minimum number of
reflections a light ray entering one end will make before it emerges from the other end?
A) 2.42 x 105
B) 2.56 x 105
C) 2.02 x 105
D) 1.85 x 105
E) 2.85 x 105
Two 100 W lightbulbs are to be connected to a 120 V source. What is the current,
potential difference, and dissipated power for each when they are connected:
(a) in parallel (the normal arrangement)?
(b) in series?
The lamps in a string of Christmas tree lights are connected in parallel. What happens if
one lamp burns out? (Assume negligible resistance in the wires leading to the lamps.)
A) The brightness of the lamps will not change appreciably.
B) The other lamps get dimmer equally.
C) The other lamps get brighter equally.
D) The other lamps get brighter, but some get brighter than others.
E) The other lamps get dimmer, but some get dimmer than others.
What is the focal length of the corrective contact lens needed by a nearsighted person
whose far point is 60 cm?
A) -60 cm
B) -30 cm
C) +30 cm
D) +60 cm
E) +130 cm
A container of water is placed on a scale, and the scale reads 120. g. Now a 20.0g piece
of copper (specific gravity = 8.90) is suspended from a thread and lowered into the
water, not touching the bottom of the container. What will the scale now read?
A) 140 g
B) 120 g
C) 138 g
D) 122 g
E) 112 g
The velocity of propagation of a transverse wave on a 2.0 m long string fixed at both
ends is 200. m/s. Which one of the following is not a resonant frequency of this string?
A) 50 Hz
B) 200 Hz
C) 25 Hz
D) 100 Hz
J. J. Thomson
A) proposed the tiny central nucleus idea.
B) discovered radium and polonium.
C) observed back-scattering from nuclei.
D) proposed the plum-pudding model.
E) invented the particle detector tube.
FIGURE 2-1
Which graph in Fig. 2-1 represents an object at rest?
A) graph a
B) graph b
C) graph c
D) graph d
E) both graphs a and d
Light travels fastest
A) in a vacuum.
B) through water.
C) through glass.
D) through plastic.
E) through diamond.