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# Physics - Questions for studying

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Chapter 35 Special Theory of Relativity
11-134) The experiments of Michelson and Morley provided
evidence that the speed of light is (a) invariant (b) the same
whether its source approaches or recedes (c) constant (d) all
of these (e) none of these
11-135) The ether theory of light propagation is (a) much used
(b) incomplete, but still useful (c) unexplained (d)
discredited
11-139) You and a friend share the same space time when there
is no (a) relative velocity between you (b) acceleration for
either of you (c) difference in your rate of heartbeats
11-140) Suppose the time taken for light to bounce to and fro
between the parallel mirrors of a light clock is 1 second, in
the frame of reference of the light clock. As seen by another
observer moving at high speed at right angles to the
to-and-fro motion of the bouncing light, the time taken
would be (a) also 1 second (b) less than 1 second (c) more
than 1 second
11-141) The stretching out of time due to motion is called time
(a) stretching (b) dilation (c) contraction (d) warp (e)
expansion
11-144) When a blinking light source moves relative to you, the
speed of the light (a) changes but its frequency remains
constant (b) remains constant but its frequency can change
(c) stays the same, as does its frequency
11-145) When you approach a blinking light source, the
frequency of its blinking (a) increases (b) decreases (c)
stays the same
11-146) When you recede from a blinking light source, the
frequency of its blinking (a) increases (b) decreases (c)
stays the same
11-147) Harry takes a space voyage and returns to find his twin
sister has aged more than he has. This is evidence that they
have been in different (a) frames of reference (b) spacetimes
(c) realms of time (d) all of these (e) none of these
11-148) According to special relativity, one can travel at
increased rates (a) both forward and backward in time (b)
backward in time (c) only forward in time
11-150) According to Einstein's theory of special relativity, (a)
space and time are aspects of each other (b) energy and
mass are aspects of each other (c) both of these (d) none of
these
11-158) Event A occurs before event B in a certain frame of
reference. In another frame of reference, event A could
occur â€” (a) after event B (b) simultaneous with event B
(c) either of these (d) neither of these
11-160) If you were to travel at speeds close to the speed of
light, you would notice that your own (a) pulse decreases
(b) shape changes (c) both of these (d) neither of these
11-162) When you approach a blinking light source which in
turn is moving towards you, you perceive an increase in (a)
both speed and frequency of the light (b) speed, but not
frequency of the light (c) frequency of the light, but not
speed
11-163) When you approach a light source, the wavelength of
light emitted appears (a) longer (b) shorter (c) the same
11-164) The frequency of a blinking light source doubles as the
light source approaches you. As the same light source
moves away from you at the same speed, its frequency (a) is
halved (b) is doubled (c) stays the same
11-165) As a blinking light source approaches you at an
increasing speed (accelerating toward you) the frequency of
the flashes (a) increases (b) decreases (c) stays the same
11-167) To outside observers, the overall sizes of objects
traveling at relativistic speeds are (a) larger (b) smaller (c)
the same size
11-170) Compared to standard earth time, there is a physical
slowing of your time when you travel at (a) relativistic
speeds (b) everyday low speeds (c) both of these (d) none
of these
times the speed of light, with momentum greater than their
mass times 0.25c. Strictly speaking, this (a) increases your
electric bill (b) does not increase your electric bill
11-174) Suppose two space ships approach each other at the
speed of light, and each sends a beam of light to warn the
other of its approach. From the frame of reference of either
space ship, the light will reach the ships (a) before they
collide (b) as they collide (c) after they collide
11-175) If you use the relativistic velocity-addition formula to
add everyday velocities, you will get (a) nonsense (b) a
significantly better result than if you add them classically
(c) a result almost identical to the classical result
11-176) A heavy meter stick has a mass of 1 kg. When the
meter stick is thrown like a spear past you, you measure its
momentum to be 2mv. What do you measure its length to
be? (a) 1 m (b) 0.87 m (c) 0.5 m (d) 0.25 m (e) none of
these
11-177) Radioactive muons formed high in the atmosphere have
an average lifetime of 2 millionths of a second and travel
toward earth at nearly the speed of light. They are so high
they should have decayed by the time they reach the earth's
surface, according to pre-relativity physics. They don't
because they (a) live longer due to time dilation (b) travel a
shorter distance due to length contraction (c) either of these
(d) neither of these
11-179) Suppose a blinking light source uniformly accelerates
away from you. As the source gets farther and farther away,
you'll notice that the frequency of the flashes (a) increases
(b) decreases (c) neither increases nor decreases
11-180) A 10 meter long spear is thrown at relativistic speeds
through a 10 meter-long pipe. (Both these dimensions are
measured when each is at rest.) When the spear passes
through the pipe, which of the following statements is true?
(a) the spear shrinks so the pipe completely covers it (b) the
pipe shrinks so the spear extends from both ends (c) both
shrink equally so the pipe barely covers the spear (d) any of
these, depending on the motion of the observer (moving
with the spear, at rest with the pipe, etc.) (e) none of these
11-182) Consider a spaceship that moves toward you at half the
speed of light. It fires a probe toward you, relative to itself,
at 0.7 the speed of light. Relative to you, the probe
approaches at about (a) 70% c (b) 87% c (c) 90% c (d)
92% c (e) 96% c

Chapter 36 General Theory of Relativity
12-1) Compared to special relativity, general relativity is more
concerned with (a) acceleration (b) gravitation (c)
space-time geometry (d) all of these (e) none of these
12-3) Suppose at the surface of the earth a person can do 20
pushups. In a spaceship far away from any gravitational
influence, accelerating at g, the same person could do (a)
less than 20 pushups (b) 20 pushups (c) more than 20
pushups
12-5) According to the principle of equivalence, observations
made in a Newtonian gravitational field are indistinguishable
from observations made in (a) any other gravitational field
(b) an Einsteinian gravitational field (c) any uniformly
moving reference frame (d) all of these (e) none of these
12-6) From a general relativistic point of view, a person on
the ground floor of a skyscraper ages (a) faster than a
person on the top floor (b) slower than a person on the top
floor (c) at the same speed as a person on the top floor
12-7) A strong gravitational field (a) slows a clock (b)
speeds up a clock (c) does not affect a clock
12-8) Special Relativity would predict slow running, and
General Relativity would predict fast running, of a clock at
the top of a tower at the (a) south pole (b) north pole (c)
equator (d) none of these
12-9) Only General Relativity would predict "unusual"
running of a clock at the top of a tower at (a) the south pole
(b) the Tropic of Capricorn (c) the equator
12-10) A measuring stick on a rapidly rotating disk will not
appear to shrink if it is oriented along the (a) circumference
(b) radius (c) either of these (d) neither of these
12-11) The measured ratio of circumference to diameter on a
disk is pi when the disk is (a) moving at relativistic speeds
(b) rapidly rotating (c) at rest (d) all of these (e) none of
these
12-13) Compared to Newton's theory of gravitation, Einstein's
theory (a) is an exception to the correspondence principle
(b) obeys the correspondence principle (c) neither of these
12-14) In a one g gravitational field, in one second, a light
beam will curve beneath a perfectly straight line by (a) less
than 4.9 m (b) 4.9 m (c) more than 4.9 m
12-15) At the top of very tall skyscraper, a sensitive watch will
appear to run (a) slow (b) fast (c) the same as at 1 g
12-16) Compared to a watch at the earth's poles, a watch at the
earth's equator should run (a) a tiny bit slower (b) a tiny bit
faster (c) at the same speed
12-17) If a star that is Alight years away from earth explodes,
gravitational waves from the explosion will reach the earth
in (a) less than 10 years (b) more than 10 years (c) 10
years
12-18) At the bottom of a well deep enough so that the
acceleration due to gravity is less than 1 g, a watch will run
(a) slow (b) fast (c) the same as at 1 g
12-19) If a star 1001ight years away explodes, time for the
gravitational waves to reach the earth is 100 years as
measured from (a) any uniformly moving reference frame
(b) any accelerating reference frame (c) any reference
frame, accelerated or not (d) the reference frame of the
waves (e) the earth
12-20) A clock on the surface of a shrinking star will run
progressively (a) slower (b) faster (c) no difference
12-22) The quantity that undergoes a red shift is (a) wave
frequency (b) wavelength (c) both of these (d) neither of
these
12-24) The orbit of Mercury processes because (a) Mercury
moves in the gravitational field of the other planets (b)
Mercury travels faster than any other planet (c) Mercury is
closest to the sun (d) the sun's gravitational field varies
along Mercury's orbit (e) none of these
12-25) Einstein's theory of gravitation obeys the
correspondence principle because it (a) corresponds to truer
description of events in very large gravitational fields (b)
agrees with proven results of Newton's theory (c) has been
proven in repeated experiments (d) is a special case of
Newton's theory (e) none of these
12-27) According to relativity theory, it is possible to reverse
time and grow younger when you (a) are near a black hole
(b) are near a very large gravitational field (c) travel at
nearly the speed of light (d) you can never grow younger
(e) none of these
12-28) If the orbit of Mercury were perfectly circular, its rate of
precession would be (a) larger (b) smaller (c) the same (d)
zero
12-29) If the elliptical orbit of Mercury were more eccentric, its
precession rate would be (a) larger (b) smaller (c) the same
(d) nonexistent
12-30) From a relativistic point of view, light (a) always
travels in straight lines (b) sometimes travels in straight
lines (c) never travels in straight lines
12-31) An astronaut falling into a black hole would see the
universe (a) red shifted (b) blue shifted
12-32) If the sun collapsed to a black hole, the time required for
the earth to orbit the collapsed sun would (a) increase (b)
decrease (c) stay the same

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Subject: Physics

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Submitted: 10 years ago.
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