Compared to the energy put into a laser, the energy of the laser beam is
A) usually much more.
B) much less.
C) the same.
D) none of the above
Answer: B
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Two stars have the same spectral type. Star X is in luminosity class III, while Star Y is in luminosity class V. Star X must be larger in radius than Star Y
Indicate whether the statement is true or false
According to current theory, the proton is made of smaller particles known as
A) electrons. B) neutrons. C) mesons. D) quarks. E) neutrinos.
The direction of the force on a current carrying wire located in an external magnetic field is which of the following?
a. perpendicular to the current b. perpendicular to the field c. Both choices A and B are valid. d. None of the above are valid.
A 4000-? resistor is connected across a 220-V power source. What current will flow through the resistor?
A) 0.055 A B) 1.8 A C) 5.5 A D) 18 A