A particle in a 453 m-long linear particle accelerator is moving at How long does the particle accelerator appear to the particle?
A) 219 m
B) 589 m
C) 104 m
D) 936 m
Answer: A
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Assume you charge a comb by running it through your hair and then hold the comb next to a bar magnet. Do the electric and magnetic fields produced constitute an electromagnetic wave?
1.Yes they do, necessarily. 2.Yes they do, because charged particles are moving inside the bar magnet. 3.They can, but only if the electric field of the comb and the magnetic field of the magnet are perpendicular. 4.They can, but only if both the comb and the magnet are moving. 5.They can, if either the comb or the magnet or both are accelerating.
Velma zooms past Mort at half of lightspeed. Velma observes Mort's clock to run
A) slow. B) on time. C) fast. D) None of the above.
The quantum mechanical model of the hydrogen atom requires that if the principal quantum number = 3, there will be permitted how many orbital magnetic quantum numbers?
a. 5 c. 4 b. 8 d. 7
Which is more massive?
A. Earth (a solid object) B. the Sun (a gaseous giant)