One prediction of Einstein's special theory of relativity is that objects traveling close to the speed of light
a. get lighter.
b. get more massive.
c. get longer.
d. disappear.
[Ques. 2] A long solenoid (n = 1 500 turns/m) has a cross-sectional area of 0.40 m2 and a current given by I = (4.0 + 3.0t2) A, where t is in seconds. A flat circular coil (N = 300 turns) with a cross-sectional area of 0.15 m2 is inside and coaxial with the solenoid. What is the magnitude of the emf induced in the coil at t = 2.0 s?
a. 2.7 V
b. 1.0 V
c. 6.8 V
d. 0.68 V
e. 1.4 V
[Ques. 3] The most distant objects yet detected in the universe are
a. quasars.
b. pulsars.
c. superclusters.
d. globular clusters.
[Ques. 4] Einstein's special theory of relativity deals with objects that are
a. being hit by X-rays.
b. entering intense gravitational fields.
c. moving close to the speed of light.
d. being hit by energetic photons.
[Ques. 5] A 50-turn circular coil (radius = 15 cm) with a total resistance of 4.0 is placed in a uniform magnetic field directed perpendicularly to the plane of the coil. The magnitude of this field varies with time according to B = A sin (t), where A = 80 T and = 50 rad/s. What is the magnitude of the current induced in the coil at t = 20 ms?
a. 11 mA
b. 18 mA
c. 14 mA
d. 22 mA
e. zero
[Ques. 6] In a halo around the Milky Way's nuclear bulge lie about 200
a. brown dwarfs.
b. quasars.
c. red supergiants.
d. globular clusters.
[Ques. 7] The term stimulated emission would be used in explaining the operation of
a. an electron microscope.
b. an X-ray tube.
c. a microwave oven.
d. a laser.
[Ques. 8] A square coil (length of side = 24 cm) of wire consisting of two turns is placed in a uniform magnetic field that makes an angle of 60 with the plane of the coil. If the magnitude of this field increases by 6.0 mT every 10 ms, what is the magnitude of the emf induced in the coil?
a. 55 mV
b. 46 mV
c. 50 mV
d. 60 mV
e. 35 mV
[Ques. 9] Which of the following is an irregular galaxy that can be seen from the Southern Hemisphere?
a. The Crab Nebula
b. The Sagittarius Dwarf
c. The Small Magellanic Cloud
d. The Horsehead Nebula
[Ques. 10] A beam of laser light is
a. neither monochromatic nor coherent.
b. monochromatic but not coherent.
c. coherent but not monochromatic.
d. both monochromatic and coherent.
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