A coil of wire is connected to a galvanometer. When a bar magnet is moved in and out of the coil, the galvanometer records a current. The current results because
a. the coil acts like a transformer
b. the changing magnetic field induces an electric field in the wire
c. an electromagnetic wave is generated
d. the wire is ferromagnetic
e. none of the above
B
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An electron of mass 9.11 × 10^–31 kg has a momentum of 2.61 × 10^–22 kg·m/s. What is its speed?
a. 0.29c b. 0.72c c. 0.69c d. 0.48c e. It cannot have this momentum since it would require a speed greater than c.
Observing at a wide range of wavelengths, astronomers have detected more than ______ different molecules in the ISM
a. 10 b. 20 c. 50 d. 100 e. 150
Seyfert galaxies are spiral galaxies with active cores
a. True b. False Indicate whether the statement is true or false
A ray of light is incident on a pane of common window glass at an angle of 35° to the normal. The angle of the reflected ray with respect to the normal is
1) 35° 2) 55° 3) 90° 4) 20° and the refracted ray within the glass may be at an angle of 5) 35°. 6) 55°. 7) 22°. 8) 75°.